At a college, the cost of tuition increased by 10%. Let y be the former cost of tuition. Use the expression y+0.10y for the new cost of tuition. Write an equivalent expression by combining like terms. What does your equivalent expression tell you about how to find the new cost of tuition?
Choose the correct answer below.
A. 0.10; add 0.10% of the former cost to the new cost.
B. 1.10y; multiply the former cost by 1.10.
C. 0.90y; multiply the former cost by 0.90.
D. 0.90; add 0.90% of the new cost to the former cost.