## Paying off Credit Loans:

Credit card balances usually carry a very high interest rate. For this reason, paying off credit balance sooner could yield substantial savings in interest costs.

It will take Ricky about 149 months to pay off the card.

We can use the following formula to compute the monthly payment for a loan with principal {eq}P {/eq}, monthly interest rate {eq}r{/eq} and number of monthly payments {eq}T{/eq}:

• {eq}\displaystyle \frac{Pr}{1 - (1 + r)^{-T}} {/eq}

In this question, we know the monthly payment is 175, instead we try to find the number of payments such that the monthly payment calculated using the above formula is exactly equal to 175, which requires solving the following equation:

• {eq}\displaystyle \frac{10,000*18.95\%/12}{1 - (1 + 18.98\%/12)^{-T}} = 175\\ 1 - (1 + 18.95\%/12)^{-T} = 0.9023809524\\ (1 + 18.95\%/12)^{-T} = 0.09761904762\\ T = 148.50 {/eq}

That is, it takes Ricky at least 149 months to pay off the loan.