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.76 per kg?	Choose the correct choice from the following options
A) 5 : 8 B) 4 : 7 C) 3 : 7 D) 9 : 5 E) 5 : 2

Rationale: "( 96 - 76 ) / ( 76 - 68 ) = 20 / 8 = 5 / 2 answer : e"
Answer: E