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April 2, 2015

April 2, 2015

Posted by **Beverly** on Saturday, April 2, 2011 at 9:09pm.

- algebra -
**Reiny**, Saturday, April 2, 2011 at 11:06pm18 = 3.5(1.12)^n

5.142857 = 1.12^n

take log of both sides and use log rules....

n = log 5.142857/log 1.12 = 14.45

so after 14 years the allowance will be below $18

but after 15 years it will be over $18

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