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Your bill in a shop is Rs. 577.80 and the shopkeeper gives a discount of 15%. How would you estimate the amount to be paid?

(i) Round off the bill to the nearest tens of Rs. 577.80, i.e., to Rs. 580.

(ii) Find 10% of this, i.e. Rs. `10/100 xx 580` = Rs.58.

(iii) Take half of this, i.e., `1/2 xx 58 = Rs. 29.`

(iv) Add the amounts in (ii) and (iii) to get Rs. 87.

You could therefore reduce your bill amount by Rs. 87 or by about Rs. 85, which will be Rs. 495 approximately.

1. Try estimating 20% of the same bill amount.

2. Try finding 15% of Rs. 375.