Answer:
.0879%
Explanation:
To write .000879 as a percent have to remember that 1 equal 100% and that what you need to do is just to multiply the number by 100 and add at the end symbol % . 
.000879 * 100 = 0.0879% 
 
And finally we have: 
.000879 as a percent equals 0.0879%