All you have to do is divide both numbers you have by 100
then multiply the two numbers you got together
15.8 and 0.15 (All you have to do is move the decimal over two spots to the right)
So 15.8x.15=2.37 and multiply this by 100 which gives you 273.
Then just subtract. 1580-273=1,343
So the answer is $1,343
