Phillip wanted to leave a 15% tip. He thought to himself that 15% = 10% plus half of 10%. Which of the following equations will help Phillip estimate the tip on a $36.00 bill correctly?

A. $3.60+ $3.60 = $7.20

B. $3.60+ 1.80 =$5.40

C. $3.60+ $0.36 = $3.96

D. $1.80+ $1.80= $3.60