Answer:
$1000
Step-by-step explanation:
If we assume that the given average applies to April, May, and June expenses, then we can use the formula for average to find June's expenses.
average expenses = (April +May +June)/3
940.21 = (945.50 +875.13 +June)/3
(3)(940.21) = 1820.63 +June
2820.63 -1820.63 = June = 1000.00
Rob's expenses in June were $1000.00.