# 10 Pre algebra questions

Review

Directions: Use the interest formula to solve each of the following problems.

1) Cathy borrows \$3280 at 0.3% simple interest per month. When Cathy pays the loan back 9 years later, what is the total amount that Cathy ends up repaying?

2) Ruth borrows \$440 at 0.6% simple interest per month. When Ruth pays the loan back 4 years later, how much interest does Ruth pay?

3) Fred borrows \$2710 at 3.8% simple interest per month. When Fred pays the loan back 3 months later, what is the total amount that Fred ends up repaying?

4)Ralph borrows \$360 at 0.7% simple interest per month. When Ralph pays the loan back 3 months later, how much interest does Ralph pay?

5) Deb borrows \$3190 at 2.9% simple interest per month. When Deb pays the loan back 5 years later, what is the total amount that Deb ends up repaying?

6) Ian borrows \$3580 at 31% simple interest per year. When Ian pays the loan back 7 years later, how much interest does Ian pay?

7) Zach borrows \$1910 at 2.6% simple interest per month. When Zach pays the loan back 3 years later, how much interest does Zach pay?

8) Craig borrows \$1000 at 9% simple interest per year. When Craig pays the loan back 11 years later, what is the total amount that Craig ends up repaying?

9) Larry borrows \$1300 at 5% simple interest per month. When Larry pays the loan back 3 years later, what is the total amount that Larry ends up repaying?

10) Fred borrows \$40 at 0.8% simple interest per month. When Fred pays the loan back 2 years later, how much interest does Fred pay?

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1. the formula is

i = Prt

what don't you understand?

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2. Formula: I = P * r * t

i don't know the answers i need the answers i do online school i think i did better in in person school i need to know the answers

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3. i just don't get it thats all i want to pass

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But, to get you started,
1) Cathy borrows \$3280 at 0.3% simple interest per month. When Cathy pays the loan back 9 years later, what is the total amount that Cathy ends up repaying?
P = 3280
r = 0.003 (that is the interest rate per period -- in this case, one month)
t = 9*12 = 108 (the number of months)
i = 3280 * 0.003 * 108 = 1062.72
Now add the interest to the principal, and she has to pay back
3280 + 1062.72 = 5342,72

Note that the total amount owed or earned is
A = P(1 + rt)

Now try the others.

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5. thank u so much ur varry helpful to me

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