Rs. (2x + 400) is invested at a rate of 20% per annum, yielding an interest of Rs. 3200 after 4 years. Calculate the interest earned when Rs. (x + 100) is invested under the same conditions.
ATQ, Equation for initial investment: 
Calculate the interest with new principal 
The interest earned with the new investment is Rs.720.
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Rohit made an investment that yielded a simple interest rate of r% per annum, allowing the principal to grow to 180% of its original amount in 5 years. ...
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