A lemonade stall, handmade greeting cards or clay diyas for a festival fair are fun ways for children to earn with a grown-up’s help. First you spend on materials. You must sell enough to get that money back; after that, each sale is earning.
Cost back first — “sell enough to get your costs back — everything after that is earning”
Sales = number sold × price of one.
Earning after costs = sales − costs.
To get the cost back, sell at least cost ÷ price of one (round up).
Use it for: School fair and festival stalls, craft sales, and money-sense projects in Class 6–8.
Worked example: Sneha spends ₹120 to start a stall and sells each greeting card for ₹15. What is the smallest number Sneha must sell to get back the ₹120? → 8
120 ÷ 15 = 8.
It divides exactly, so 8 cards.
Check: 8 × 15 = 120 and 7 × 15 = 105 is not enough ✓
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
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