Based on the information given the amount of interest that John pay in all is his $7,200,000.
Using this formula
Interest=Amount borrowed×Number of years×Interest rate
Where:
Amount borrowed=$6,000,000
Number of years=15 years
Interest rate=8%
Let plug in the formula
Interest=$6,000,000×15×8%
Interest=$7,200,000
Inconclusion the amount of interest that John pay in all is his $7,200,000.
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