David has just received his income tax refund of $1438.11, and he needs $1742 to buy a new television. If his money can earn % simple interest , how long must he invest his tax refund? years


what formula do i need to use?

t = ((Pt / Po ) -1 ) / r

t = Time in years.
Pt = Principal after time t.
Po = Initial investment.
r = Annual percentage rate(APR) expressed as a decimal.

Practice: Calculate t for an APR
of 10% using your dollar values.
You should get 2.113 years.

Caution! Make sure all parenthesises are in place.