Answer:
The last answer choice is correct, I am pretty sure.
Just go on the calculator (like Desmos) and just use the decimals to determine which one is true.
First write the inequality: 15

4.75x +3.50
Then to solve, first subtract 3.50 from both sides to get:
11.50

4.75x
Then divide by 4.75 to get 2.42, and since you can't buy .42 of a bag of fruit, you round down. So your final answer would be 2 bags of fruit.
81 inches converted to feet is 6.75 feet