Marwa bought a book of Rs. 60 and a slate of Rs. 80. Find the percentage profit if she sold at Rs. 80.

Explanation

Step 1: Total Cost Price (CP)

$$CP=60+80=140$$

Step 2: Selling Price (SP)

$$SP=80$$

Step 3: Profit or Loss

$$text{Profit/Loss} = SP - CP = 80 - 140 = -60$$

This is a loss of Rs. 60, not a profit.

Step 4: Percentage Loss

Loss %=Loss/CP​×100= 60​/140×100

Calculate:

60​/140=0.42857
$$0.42857\times 100=42.857\%\approx 42.86\%$$

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