If the cost of a long-distance phone call is c cents for the first minute and 2/3 c cents for each additional minute, what is the cost, in cents, of a 10-minute call of this type?
A.5/3 c
B.6c
C.20/3 c
D.7c
E.23/3 c

A.5/3
B.6c
C.20/3
C.7c
E.23/3