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26-08-2017
Mathematics

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26-08-2017

y = 10x + 400
y = 30x + 300

10x + 400 = 30x + 300
20x = 100
x = 5 months(answer to first question)

y = 10(5) + 400
y = 450

After 5 months, Tina will save $450 with either option.

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