The cost price and selling price of an article is a : b.

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The cost price and selling price of an article is a : b. If b is 200% of a then the percentage of profit on cost price is

Given that , The cost price and selling price of an article = a : b
According to question ,

b = a ×	200	= 2a
	100

		b	= 2 ⇒	b	- 1 = 2 - 1
		a		a

⇒		b - a	= 1 ⇒	b - a	× 100 = 100
		a		a

∴ Gain percent = 100%