Straight answers for everyday decisions
Short answer: Paying only the minimum keeps your card in good standing but charges interest on the rest. In our example, a 50,000 balance at 3.5% a month takes almost 11 years and 91,021 in interest to clear on minimum payments alone.
How card interest is charged, why the minimum payment keeps you in debt for years, and a worked example.
Short answer: Charging speed depends on the charger, the device and the cable together. For most phones any decent USB-C cable works. For laptops over 60 W you need a cable rated for 5 A (100 W or 240 W).
All USB-C cables look the same, but they carry very different amounts of power and data. What the ratings mean and which cable you actually need.
Short answer: EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1). Borrowing 5,00,000 at 12% for 3 years costs 16,607 a month. Quoted as a flat rate, the same 12% costs nearly twice the interest.
The EMI formula with worked examples in rupees, and how to compare flat and reducing-balance interest before you sign.
Short answer: Carry it in hand luggage only. Anything up to 100 Wh (about 27,000 mAh) is allowed without asking, and 10,000 mAh is the right size for most people.
Capacity, charging speed and the watt-hour limits airlines enforce, explained so you buy the right size the first time.
Short answer: Linen is the coolest and dries fast. Cotton is comfortable but holds sweat and dries slowly. Polyester dries quickly but can trap heat and smell. For humid heat, choose linen or a light, loose cotton.
How common fabrics handle heat and sweat, and which to choose for the monsoon, travel and everyday wear.
Short answer: The washtub shows washing (dots mean temperature), the triangle bleach, the square drying, the iron ironing (more dots, hotter) and the circle dry cleaning. A cross through any symbol means don't.
What the washtub, triangle, square, iron and circle symbols mean, so clothes don't shrink, fade or melt.
Short answer: Divide 72 by the yearly rate to get the years needed to double. At 8% it takes about 9 years; at 6%, about 12. It works for inflation too: at 6% inflation, prices double in about 12 years.
A one-line mental shortcut for growth, interest and inflation, with how accurate it really is.
Short answer: Compound interest earns interest on your interest. On 1,00,000 at 8% for 5 years, simple interest pays 40,000, while interest compounded every quarter pays 48,595.
How banks calculate interest on fixed deposits, why compounding frequency matters, and how to compare offers properly.
Short answer: Your body clock shifts about an hour a day. The fastest fix is light at the right time: morning daylight after flying east, evening daylight after flying west, plus sleeping on local time from day one.
Why flying east is harder than flying west, how to use daylight to reset your body clock, and what helps on the flight itself.
Short answer: There is no single standard. Many airlines allow a bag of about 55 × 35 × 20 to 25 cm and 7 kg in economy, but limits vary, so check your ticket and measure the bag with its wheels and handles.
The common cabin bag size, typical weight limits, the personal item, and how to avoid paying at the gate.
Short answer: Many countries require your passport to be valid for at least six months after you arrive or leave. The Schengen area asks for three months after departure. Airlines check this and can refuse to fly you.
Why airlines refuse boarding to passports that haven't expired yet, which rules apply where, and what to check before you book.
Short answer: An inverter AC or fridge varies its compressor speed instead of switching it fully on and off. It uses less electricity and is quieter when it runs for many hours, but costs more to buy.
An inverter air conditioner has nothing to do with your home power inverter. What it does, when it saves money, and when it doesn't.
Short answer: Add up the watts of everything you want to run, add about 25% headroom, and divide by the power factor (often 0.6 to 0.8) to get the VA rating. Backup time depends on the battery, not the UPS.
What VA and watts mean, how to add up what you want to run, and how to estimate how long a battery will last.
Short answer: India and Nepal mostly use UK sizes. Men's US is UK + 1, women's US is UK + 2, and a men's UK 8 is about EU 42.
How shoe sizes convert between systems, why brands disagree, and the one measurement that avoids returns when you buy online.
Short answer: Each container can hold 100 ml at most, and they all have to fit in one clear one-litre bag. Medicine and baby food are the exceptions.
What counts as a liquid, how to pack it, and the exceptions for medicine, baby food and duty-free.