how do you get the percent of another number? like 18% of 49
18% is the same as 18/100 which is also the same as 0.18
so
18/100*49 ≈ 3.67*10-3 ≈ 0.00367
or
0.18*49 equals exactly the same.
You change the 18% to a decimal, and then multiply the decimal by 49! :D