Question

2 13 3 14 4 15 5 16 The cost price of 20 notebooks is the same as the selling price of x of those notebooks. If the profit is 25%, what is the value of x?

Answer 1

The cost price of 20 notebooks is the same as the selling price of x of those notebooks
let's assume price of one notebook be 10
so, cost price of 20 notebook = 20 × 10 = 200
so, Selling price of x notebook = 200

the profit is 25%
so, Selling price of x notebook = Cost price of x notebook + 25% of Cost price of x notebook
200 = 100% x + 25%x
200 = 125%x
200 = 125x/100
200 = 1.25x
x = 200/1.25
x = 160

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