Seller selling an apple for Rs.15, a Seller loses 1/6th of what it costs him. The CP of the apple is?  Choose the correct choice from the following options
A) 10
B) 12
C) 16
D) 18
E) 20

Rationale: "sp = 15 loss = cp 16 loss = cp − sp = cp − 15 ⇒ cp 16 = cp − 15 ⇒ 15 cp 16 = 15 ⇒ cp 16 = 1 ⇒ cp = 16 c"
Answer: C