Aman buys a dozen computers for $15,000. he sells each of the computers for $2150. what percent profit does he earn?

show work!

We calculate the raised money 
raised money=number of computers x price of a computer.
raised money=12($2150)=$25,800

We calculate the profits:
profit=raised money-money spent
profit=$25,800 - $15,000=$10,800

We calculate the percent profit.

$15,000=100%

therefore:

$15,000100%
$10,800    x

x=($10,800 * 100%) / $15,000=72%

the percent profit will be 72%.