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=
<gadget id="calculator">1600*.6</gadget>
<output>960</output>
960 vibrations per second faster than the lowest setting.
So it vibrates at 1600+960=
<gadget id="calculator">1600+960</gadget>
<output>2_560</output>
2560 vibrations per second.
Matt uses it for 5 minutes so that is 5*60=
<gadget id="calculator">5*60</gadget>
<output>300</output>
300 seconds.
That means he experienced 2560*300=
<gadget id="calculator">2560*300</gadget>
<output>768_000</output>
768,000 vibrations.

<result>768_000</result>