Which answer describes the calculations that could be used to solve this problem?

mike bought 7 tickets for the baseball game. each ticket cost $8. he gave the cashier a $100 bill. how much change would mike get?

a.
add $8 + 7. then subtract the sum from $100.

b.
multiply $100 × 7. then add $8 to the product.

c.
divide $100 ÷ 7. then add 8 to the quotient.

d.
multiply 7 × $8. then subtract the product from $100