Correct Answer - Option 1 : 59%
Given
wrong weight = 630 gram instead of 1000 g
Formula used
Gain% = (Error)/(True value - error) × 100
Error means weighing less than the actual value and true value is the actual value.
Calculation
Error = 1000 - 630
⇒ 370 gram
True value = 1000 gram
Gain% = [370/(1000 - 370)] × 100
⇒ (370/630) × 100
⇒ 58.73% or 59%(approx)
∴ The gain percentage is Rs.59%.