What js the power of 10 when 75,200 is written in scientific notation

the power of 10 when 75,200 is written in scientific notation is   7.52x10^4

The correct answer is:

4.

Explanation:

In scientific notation, we place the decimal behind the first non-zero digit in the number.  For 75,200, this is 7.  

We then count the number of places we must move the decimal to place it here.  In this problem, we move the decimal 4 places.  This is the exponent for 10.

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the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

i already answered it by 34/s