It's so simple, right?

Let Andrew bought the article for $ $x$ , then selling price is $x+x \times \dfrac{10}{100}=\dfrac{11x}{10}$ .

Doubling the selling price, Andrew would have sold the article at $ $\dfrac{22x}{10}$ . Hence the profit would be $\dfrac{22x}{10}-x=\dfrac{12x}{10}$ .

Now using the formula for profit percentage i.e. $\boxed{ \text{ Profit Percentage } =\dfrac{ \text{ Profit } }{ \text{ Cost Price } } \times 100 }$ .

Profit %= $\dfrac{ \frac{12x}{10}}{x} \times 100=120$ % $\square$

enjoy!

Not even a 30 sec question.Let he sold for $110.So CP is $100 and under the condition of SP being $220,profit % numerically = profit=120