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Can someone please help me to solve it

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Can someone please help me to solve it. I do not the how this correct answer came.

Based on her TDSR of 40% and GDSR of 30%, Susan has been informed that the maximum monthly mortgage payment she qualifies for is $1,746. The qualifying interest rate for mortgages is 3.4% and assume a 25 year amortization. Based on this, what is the largest mortgage she would be able to qualify for? Input the number to the nearest dollar with no minus sign.

Correct Answer: 353,437 ± 5