To find out how much Toby spends on grapes, we multiply the cost per pound by the number of pounds he buys:
Cost per pound = $1.57
Number of pounds = 4
Total cost = Cost per pound × Number of pounds
Total cost = $1.57 × 4 = $6.28
So, the amount of money Toby spends is $6.28.
The correct answer is A. $6.28.