SOLUTION: Joanna decided to invest the $500 that she had received as graduation presents. She invested part in a 10% annual interest money market account and the rest in a 5% annual interest

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Question 122506: Joanna decided to invest the $500 that she had received as graduation presents. She invested part in a 10% annual interest money market account and the rest in a 5% annual interest CD. How much did she invest in the money market account if she made $42.50 in interest during the first year?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = amount invested in money market account
.1x+%2B+.05%28500+-+x%29+=+42.5
.1x+%2B+25+-+.05x+=+42.5
.05x+=+17.5
x+=+350
She invested $350 in the money market account