A man lent 60000 Rs. partly at 5% and the rest at 4% simple interest. If the total annual interest is 2560 Rs. the money lent at 4% was :
[A]30000
[B]40000
[C]44000
[D]45000

44000
Let the amount lent at 4% be x
∴ Amount lent at 5% = (60000 – x)
According to the question,
$\frac{(60000-x)\times 5\times 1}{100}+\frac{x\times 4\times 1}{100} = 2560$
$=> 300000-5x+4x = 256000$
$=> x = 300000 - 256000 = 44000\ Rs.$
Hence option [C] is correct answer.