Based on the amount that the Wong family pays every month, the total amount of interest and principal that they will pay after 30 years is $358,200.
The monthly payment of $995 includes both the interest payment and the principal.
The total to be paid in 30 years is:
= Amount per month x Number of months in year x Number of years paid
= 995 x 12 x 30
= $358,200
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