If a discount of 20% off the retail price of a desk saves mark$45 how much did he pay for the desk?

$180

Step-by-step explanation:

what is 45 20% of? This is what we need to find! To do this we have to take 45 and divide it by .2 which will give us 225. To check that this is the answer we take 45 and divide it by 225. This brings us back to 20%. He wouldve paid $225 for the desk, but there was a $45 discount, and after subtracting the discount we are left with $180

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8