Math- double check me please

In a shipment of 1200 parts, 60 were found to be defective. What percent of the parts were faulty?
a.60
b. 1200
c what percent
d. shipment
answer:a
Ms. Jefferson has been given a loan of 20,000 for a 1 year. If the interest charged is $800, what is the interest rate on the loan?
answer: 4.5%
A railing for a deck requires pieces if redwood 3ft, 10in., 12ft 6in., and 5ft 4in. long. What is the toal length of material that is needed?
answer: 21ft 10in.

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  1. The correct answer isn't given for the first problem. 60 out of 1200 is not 60 percent.

    Your second and third answers are not correct.

    Please try again.

  2. first one:
    60/1200 = 0.05 = 5%
    You must have a typo in your answer choices.

    second one: 800/20000 = .04 = 4% not 4.5%

    third one: I got 21 feet 8 inches

    (join the rest of the world and GO METRIC to avoid such awkward calculations)

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    posted by Reiny

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