Business math and statistic
posted by Saida .
Tamara borrowed $6,000 at 6% and ended up paying $900 in simple interest. For how long was the loan?

I = prt
900 = 6,000 * 0.06t
900 = 360t
900/360 = t
2.5 = t 
If 45% students of a class has taken mathematic and 85% students has taken biology find the percentage of such students of a class who have taken biology.

2.5 years
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