What did Levine and McGuinnis observed the antennapedia gene use to light up the antennapedia gene to be able to observe when the gene was being turned on and off during development of the body

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

not sure if this is what you'r looking for nnew= nold

whats the answer to your question?