Rajni invested ₹15000 at simple interest for 2 years at the rate of R% and gets an interest of ₹2100.He invested total amount (Principal+Interest) in a scheme.which offered compound interest at the rate of (R%+x%) for two years.→What are the possible integral values of 'x%' so that obtained compound interest is less than ₹3000. (i) 1% (ii) 2% (iii) 3% (iv) 4% (v) 5%

Rajni invested ₹15000 at simple interest for 2 years at the rate of

1.	Rajni invested ₹15000 at simple interest for 2 years at the rate of R% and gets an interest of ₹2100.He invested total amount (Principal+Interest) in a scheme.which offered compound interest at the rate of (R%+x%) for two years.→What are the possible integral values of 'x%' so that obtained compound interest is less than ₹3000. (i) 1% (ii) 2% (iii) 3% (iv) 4% (v) 5%
Answer» only (i) only (i).(ii) only (i).(ii)and(III) only (i).(ii).(iii) and (iv) Solution :`(2R)/100 xx 15000 = 2100` R = 7% Now for x =1 R = 8%for CI EquivalentCI at rate of 8%for 2 yrs = 8+ 8+ ` 64/100` = 16.64% CI at 8%for 2 yr ` = ( 16.64)/100 xx 12100 = 16.64 xx 121` APPROXIMATELY=` 16.64 xx 121 = 2013` For9% ` Cl = ( 20 .13)/100 xx 12100 = 20.13 xx 121` Approx =` 20 xx 121 = 2420` For `10 % = 24/100 xx 12100 = 2904` So, 3 values of x are possible i.e, 1,2, and 3 .