Money calculations
Bills, best buys and change.
At the supermarket
A bill lists each item, its price and the total. Prices can use decimals: ৳42.50 means 42 taka 50 poisha. We add and subtract money like decimals.
Reading a bill
Cost = quantity × price. 5 × ৳68 = ৳340. Add every cost to find the total: ৳755.
Best buy
Find the unit price to compare. 500 g for ৳90 → ৳18 per 100 g. 200 g for ৳40 → ৳20 per 100 g. The 500 g pack is cheaper per gram.
Change from ৳1000
Count up from the total to the amount paid. 755 → 800 is 45; 800 → 1000 is 200. Change = ৳245.
Profit and loss
A shopkeeper buys a fan for ৳600 and sells it for ৳750. Profit = selling price − cost = ৳150. If it sold for only ৳550, that would be a loss of ৳50.
Currencies
Different countries use different money. $10 is about 10 × ৳120 = ৳1200. If a book costs £5 online, it is about 5 × 160 = ৳800.
What I learnt
- I can calculate costs and totals.
- I can find change.
- I can compare prices to find a best buy.