Cost price of comp system = Rs. A
Cost Price of color printer = Rs. B
0.9 A + 1.2 B= A + B
0.2 B = 0.1 A
A = 2B
(A+ B) - (1.05A + 0.85B) = 800
(2B + B) - (2.10B + 0.85 B) = 800
3B - 2.95 B = 800
0.05 B = 800
B \(=\frac{800}{5}\times100\)
= 16, 000.
So the correct option is (A)
A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 at a credit of 1 year. If the rate of interest is \(10\%\) per annum, the man.
A man sells Rs. 5000, \(12\%\) stock at 156 and invests the proceeds partly in \(8\%\) stock at 90 and the balance in \(9\%\) stock at 108. He thereby increase his income by Rs. 70. How much of the proceeds were invested in each stock?