Answer:
79 dollars
Step-by-step explanation:
a = 51 + b
Substitute the number of books, 28, he sold into the equation and solve for his earnings.
a = 51 + b
a = 51 + 28
a = 79
16 because 3 divided by 8 is 0.375 and 6 divided by 0.375 is 16.
The answer is B.55.8. Hope this helps!!