8.025 x 10*-8 in standard form

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?