A construction company is moving large rocks. It takes 3/4 hour to move 12 rocks. The construction company has already moved 60
of the 144 rocks that need to be moved. How long, in hours, will it take the construction company to move the remaining rocks? *
1 answer:
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Answer: 40 %
Step-by-step explanation:
Let the amount of one card = x
Hence, the value of 20 cards ( Principal amount ) = 20x
And, the value of 22 cards ( Total amount after 3 month ) = 22x
⇒ Total interest in 3 month = 22x - 20x =2x
Let the annual interest rate = r %
( By the formula of simple interest rate )
Hence, the annual rate of interest = 40%