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. 6300?
Select: A) rs . 5870 B) rs . 5991 C) rs . 6020 D) rs . 7670 E) none of these

Rationale: "explanation : total sale for 5 months = rs . ( 5420 + 5660 + 6200 + 6350 + 6500 ) = rs . 30,130 therefore , required sale = rs . [ ( 6300 * 6 ) – 30,130 ] = rs . ( 37800 – 30,130 ) = rs . 7670 answer d"
Answer: D