Correct Answer - Option 1 : 136
Given:
Seven friends spent Rs.14 each on a project. The eighth friend spent Rs.21 more than the average expenditure of all.
Concept used:
Average
Calculation:
Let the average expenditure of all eight friends be Rs. x
Seven friends spend Rs.14 on a project
Sum = 14 × 7 = Rs.98
As per the question
⇒ \(\frac{{98\ +\ x\ +\ 21}}{8} = x\)
⇒ x + 119 = 8x
⇒ 7x = 119
⇒ x = 17
Total amount spend by them all
⇒ 98 + (17 + 21) = Rs.136