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3 years ago

15

John wants to buy a new laptop computer the computer store sells laptops for $480 or 9 credit payments of $58 how much interest

would John pay if he paid for the computer with credit ?

1 answer:

Neko [114]3 years ago

5 0

First you would need to find out how many 9 payments of 58$ would be and that is 522. Then you would need to subtract the 522 and the 480 and your answer would be 42$ so the interest would be 42$

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Answer:

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Step-by-step explanation:

Let $(ab)$ represent a number with $a$ in the ten's position and $b$ is the one's position.

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It says if 18 is added to the number $(ab)$ , then the result is $(ba)$ .

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We are given then:

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$b+18=10b-9a$

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Divide both sides by 9:

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Rearrange by commutative property:

$2=-a+b$

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-------------------------Add equations together (this will eliminate the variable $a$ and allow you to go ahead and solve for $b$ :

$0+2b=12$

$2b=12$

Divide both sides by 2:

$b=\frac{12}{2}$

Simplify:

$b=6$

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So the original number is (46).

18 more than 46 is 18+46=(64) which is what we wanted.

We also have the sum of 4 and 6 is 10 as well.

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