If the amount in a bill is decreased by 10%, then ₹279 is to be paid. How much is the original bill?

Correct option is D

Given:

The amount in the bill is decreased by 10%, and ₹279 is to be paid after the reduction.

Solution:

Let the original amount be x.

After a 10% reduction, the remaining value is 90% of the original amount.

​$$0.90 \times x = 279.$$​​

x =$$\frac{279}{0.90} = 310$$​

The original bill amount is ₹310.

Alternate Method:

Ratio 10 : 9

Original amount = $$\frac{279}9 \times 10 = 310$$​​