If X is invested in a bank at a rate of simple interest of y% p.a. for two years, then the interest earned is 600. if X is invested at y% p.a., for two years when the interest is compounded annually, the interest is 615. What is the value of X?  Choose the correct choice from the following:	A) 8000	B) 6000	C) 5000	D) 4000	E) 3000
Simple way to solve this question is to use options.   From SI, we know that X*y=30,000.   Now, put the value of X = 6000, we will have y = 5%   To calculate CI,   Now, we know 1st year Amount= 6000+5% of 6000= 6300.   2nd year, Amount = 6300 + 5% of 6300 =6615   We can see after 2 years Interest = 6615-6000= 
<gadget id="calculator">6615-6000</gadget>
<output>615</output>
615. hence, it satisfies the question. Hence 6000 is the correct answer
<result>B</result>
If X is invested in a bank at a rate of simple interest of y% p.a. for two years, then the interest earned is 600. if X is invested at y% p.a., for two years when the interest is compounded annually, the interest is 615. What is the value of X?