30% of what number is 90
a.300
b.320
c.340
8% of what number is 122
a.1,255
b.1,552
c.1,525
15% of what number is 24
a 106
b.160
c.601
60% of what number is 42
a.50
b.60
c.70
20% of what number is 80
a.400
b.300
c.200​