Solution
30% of a = b Eq.(i)
b% of 50 = ? Eq.(ii)
Put Eq.(i) in Eq.(ii).
? = (30% of a)% of 50
= $$\frac{(30\%\ of\ a)}{100}\times50$$
= $$\frac{(30\%\ of\ a)}{2}$$
= $$\frac{(30\%\times a)}{2}$$
= 15% of a
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