In what ratio mental A at Rs.68 per kg be mixed with another metal at Rs.96 per kg so that cost of alloy (mixture) is Rs.80 per kg?	Choose the correct option:
A) 5 : 8	B) 4 : 7	C) 4 : 3	D) 9 : 5	E) 9 : 8

Rationale: ( 96 - 80 ) / ( 80 - 68 ) = 16 / 12 = 4 / 3 answer : c
Answer: C