how to subtract 10% from amount 324?
Two ways:
1-
10% means: 10 / 100 =0.10
0.10 x 324 =32.40
324 - 32.40 =291.60 First way.
2-
100% - 10% =90%
90% means: 90 /100 =0.90
0.90 x 324 =291.60 Second way.