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I just need an equation for me to fill out please!

3. Each year on the same day, Susan deposits $275
into a savings account that earns simple interest at
a rate of 4.5%. She makes no withdrawals. In 5
years, how much interest does the account earn?
A $12.38
B $61.90
C $99.01
D $185.64

4. Luke can purchase a 12-pound item from several
different retailers. Which of the following is the
best buy?
A Buy online for $15 plus pay shipping and
handling costs of $0.79 per pound.
B Buy online for $17 plus pay shipping and
handling costs of $0.69 per pound.
C Buy at a local store where the item’s price is
$24.99, and use a $3-off coupon.
D Buy at a local store where the item’s regular
price is $22.50 and it is on sale for 10% of

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6 answers
  1. Oh and on number 4 letter D, I meant to put 10% off, and not of!

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  2. This is a very strange bank. Using the formula I=Prt. we have
    275*0.045*5 = 61.875 on the 1st year's deposit
    275*0.045*4 = 49.5 on the 2nd deposit
    and so on, giving
    275*0.045*(5+4+3+2+1) = 275*0.045*15 = 185.625 total interest

    Just compare the prices.
    (A) 15+12*0.79
    (B) 17+12*0.69
    (C) 24.99-3.00
    (D) 22.50 * 0.90

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    oobleck
  3. 3. is D?

    4.
    A 24.48
    B 25.28** (because it is the highest)
    C 21.99
    D 20.25

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  4. Please check @Oobleck

    P.S. I love your name 😂

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  5. 3D is correct
    4. but the best buy is usually considered to be the one with the lowest price, right?

    Now go read Bartholomew and the Oobleck by Dr. Seuss.

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    oobleck
  6. 4 is D

    And I will read that right away!

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