Which equation can be used to find the answer?


After two months, Rachel has saved enough money to buy an MP3 player. During the second month, she saved $87 and she pays $199 for the MP3 player.


How much did Rachel save during the first month?


A.

m = 87 • 2

m = 174

$174


B.

199 + 87 = m

m = 286

$286


C.

m + 87 = 199

m = 112

$112


D.

m – 87 = 199

m = 287

$287