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bija089 [108]
2 years ago
7

If the simple interest on ​$4000 for 2 years is ​$400​, then what is the interest​ rate?

Mathematics
1 answer:
ivanzaharov [21]2 years ago
6 0

Step-by-step explanation:

the answer is 5 percentage because the formula is 100 * 400 over 4000 * 2

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X-3y-7=0 , 3x-3y-15=0 solve this using cross multiplication​
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Answer:

x = 4 , y = -1

Step-by-step explanation:

x - 3y = 7 -- (1)

3x - 3y = 15 -- (2)

Rewriting (1), x = 3y + 7 -- (1)'

Substituting (1)' into (2),

3 ( 3y + 7 ) - 3y = 15

9y + 21 - 3y = 15

6y = -6

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Substituting (3) into (1),

x - 3 ( - 1 ) = 7

x + 3 = 7

x = 4 -- (4)

According to (3) and (4),

x = 4 , y = -1

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