RRB Government Jobs Exams Numerical Ability Percentage

A shopkeeper purchased 200 bulbs for Rs. 10 each. However, 5 bulbs were fused and had to be thrown away. The remaining were sold at Rs.12 each. What will be the percentage profit?

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RRB Other Question

Four-fifth of a number is 10 more than two-third of the same number. What is the number?
What number should replace both the question marks (?) in the following question ?
?/144= 49 /?