Dropbox charges $3.10 for first 1/5 of a month for 500 GB storage, plus $0.40 for each additional 1/5 of a month. What would Dropbox charge for a data storage of 500 GB for 8 months ?
Choose the correct option:
A) $15.60
B) $16.00
C) $17.80
D) $18.70
E) $19.10
first 1/5 month charge = $3.10   rest of the months = 8 - (1/5) = 39/5   charge for the rest of the months = 39 *0.4= 
<gadget id="calculator">39 *0.4</gadget>
<output>15.6</output>
15.6   total charge= 3.10+15.6= 
<gadget id="calculator">3.10+15.6</gadget>
<output>18.7</output>
18.7   Answer is $18.70.
<result>D</result>
Dropbox charges $3.10 for first 1/5 of a month for 500 GB storage, plus $0.40 for each additional 1/5 of a month. What would Dropbox charge for a data storage of 500 GB for 8 months ?