Homework Help: Math

Posted by Terri on Sunday, April 29, 2012 at 10:45pm.

Luis has $150,000 in his retirement account at his present company. Because he is assuming a position with another company, Luis is planning to "roll over" his assets to a new account. Luis also plans to put $3000/quarter into the new account until his retirement 20 years from now. If the new account earns interest at the rate of 8%/year compounded quarterly, how much will Luis have in his account at the time of his retirement?

Math - Steve, Monday, April 30, 2012 at 11:27am
assuming he adds 3000 at the beginning of each quarter, the account will have

1 quarter: 150000*1.02+3000*1.02
2 qtrs: 150000*1.02^2 + 3000*(1.02^2 + 1.02)
n qtrs: 150000*1.02^n + 3000(1.02 + 1.02^2 + ... + 1.02^n)
= 150000*1.02^n + 3000 (1.02^n-1)/(1.02-1)
= 150000*1.02^n + 3000(1.02^n-1)/.02
= 150000(1.02^n + 1.02^n - 1)
= 150000(2*1.02^n - 1)

so, after 20 years (80 quarters), he will have $1,312,631.75
Math - Steve, Monday, April 30, 2012 at 11:29am
Oops. the formula is

150000(1.02^n + 1.02^(n+1) - 1)

so $1,327,258.06

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