The average cost of 10 items is Rs.89. If one item costs Rs.35, then find the average cost of remaining 9 items (in Rs.).

Correct option is B

Given:
Number of items = 10
Average cost = Rs. 89
Cost of one item = Rs. 35
Formula Used:
Average = $$\frac{\text{Total}}{\text{Number of items}}$$​​
Solution:
Total cost of 10 items = Average × Number of items = 89 × 10 = Rs. 890
Total cost of 9 items = Total cost of 10 items - Cost of one item = 890 - 35 = Rs. 855
Average cost of 9 items = $$\frac{\text{Total cost of 9 items}}{\text{Number of items}} = \frac{855}{9} = \text{Rs. } 95$$

Alternate Method: