A grocer has a sale of Rs. 5420, Rs. 5660, Rs. 6200, Rs. 6350 and Rs. 6500 for 5 consecutive months. Find the sale he should have in the sixth month, so that he gets an average sale of Rs. 6000? Choose the correct choice from the following.
A) rs . 5870
B) rs . 5991
C) rs . 6020
D) rs . 6850
E) none of these

Rationale: "explanation : total sale for 5 months = rs . ( 5420 + 5660 + 6200 + 6350 + 6500 ) = rs . 30,130 therefore , required sale = rs . [ ( 6000 * 6 ) – 30,130 ] = rs . ( 36000 – 30,130 ) = rs . 5870 answer a"
Answer: A