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### TR Smith says

720(1 - 0.10)(1 - 0.15) = 720x0.90x0.85 = 550.80

The discount was 15%, so the answer is (3)

### Taleb AlDris says

Yes, it is 15%.

Here is the calculation.

720(1-10%)= 648

He paid 550.8

648-550.8=$97.2 second discount

97.2/648=15%