Matt buys a massager.  At the lowest setting, it vibrates at 1600 vibrations per second.  At the highest setting, it vibrates 60% faster.  Matt uses it for 5 minutes at the highest setting.  How many vibrations does he experience?
At the highest setting, it vibrates 1600*.6=<<1600*.6=960>>960 vibrations per second faster than the lowest setting
So it vibrates at 1600+960=<<1600+960=2560>>2560 vibrations per second
Matt uses it for 5 minutes so that is 5*60=<<5*60=300>>300 seconds
That means he experienced 2560*300=<<2560*300=768000>>768,000 vibrations
#### 768000