A man buys calculators at Rs.120 each and sells them at Rs.150 each. What percentage of profit does he make on the sale of each calculator?

A man buys calculators at Rs.120 each and sells them at Rs.150 each. What percentage of profit does he make on the sale of each calculator?

A. 50%

B. 30%

C. 10%

D. 25%

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