Find the value of the expression using scientific notation C

Find the value of the expression using scientific notation. Calculator output is not acceptable. 240,000,000,000,000 x 0.00000000003 0.000000008 x 0.0000000015

Solution

5) [ 240,000,000,000,000 x 0.00000000003]/[ 0.000000008 x 0.0000000015]

{24x10^13x3x10^-11}/[8x10^-9 x 15 x 10^-10]

( 72x 10^2)/120 x10^-19

0.6 x10^(2+19)

0.6 x 10^21

6.0 x 10^20