# Need math help to Solve Problems about the rate of simple interests

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A sum of \$12,500 amounts to \$15,500 in 4 years at the rate of simple interest. What is the rate of interest?

An automobile financier claims to be lending money at simple interest, but he includes the interest every six months for calculating the principal. If he is charging an interest of 10%, the effective rate of interest becomes

A lent \$5000 to B for 2 years and \$3000 to C for 4 years on simple interest at the same rate of interest and received Rs. 2200 in all from both of them as interest. The rate of interest per annum is

A sum of \$725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of Rs. 362.50 more is lent but at the rate twice the former. At the end of the year, S33.50 is earned as interest from both the loans. What was the original rate of interest?

A man took loan from a bank at the rate of 12% p.a. simple interest. After 3 years he had to pay \$5400 interest only for the period. The principal amount borrowed by him was:

Carnegie Mellon University

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Anonymous
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