Correct
Explanation
"The power of" designates how many times a number is being multiplied by itself. Basically, 5 x 5 = 25, and 5 x 5 x 5 = 125, and 5 x 5 x 5 x 5 = 625.
Solve this puzzle
A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had ... apples.