If Rs.420 amount to Rs.540 in 4 years, what will it amount to in 6 years at the same rate % per annum?	Choices:
A) s . 575  B) s . 595  C) s . 590  D) s . 600  E) s . 585

Rationale: 80 = ( 420 * 4 * r ) / 100 r = 7.14 % i = ( 420 * 6 * 7.14 ) / 100 = 180 420 + 180 = 600 answer : d
Answer: D