The number of coins in a collection increased from 9 to 90 . What was the percent increase in the

Question

The number of coins in a collection increased from 9 to 90 . What was the percent increase in the number of coins in this collection?

Accepted Answer

Choice D is correct. It's given that the number of coins in the collection increased from 9 to 90 . It follows that the number of coins in the collection increased by 90 - 9 , or 81 . Let x % represent the percentage that 81 is of 9 . The value of x can be found using the proportion 81 9 = x 100 , or 9 = x 100 . Multiplying both sides of this equation by 100 yields 900 = x . Thus, when the number of coins in the collection increased from 9 to 90 , the percent increase was 900 % . Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.

Question the-nu