An internet service provider charges $3.10 for the first 1/5 of a day plus $0.40 for each additional 1/5 of a day. What would this company charge for an internet usage that was 8 days long?  Pick one:  A) $15.60  B) $16.00  C) $17.80  D) $18.70  E) $19.10
first 1/5 day = $3.10   rest of the days = 8 - (1/5) = 39/5   charge for the rest of the days = 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>
An internet service provider charges $3.10 for the first 1/5 of a day plus $0.40 for each additional 1/5 of a day. What would this company charge for an internet usage that was 8 days long?