Algebra
posted by
Mark on
.
If a computer costs an electronics dealer $300, and she sells them for $800, what is her rate of profit based on the selling price?
I know the answer is 62.5% but could someone show me how to get this answer , thanks

Algebra 
drwls,
proftt rate (as a fraction of selling price) = (800300)/800)
= 5/8 = 62.5%

Algebra 
Chenita,
Mitsuko salary for next year is $44,940. This represents a 7% increase over this year's salary. Find mitsuko present salary