Solve from question 1-10

\begin{tabular}{|c|c|} \hline 1 & \begin{tabular}{l} A certain sum of money becomes 3 times of itself in 12 \\ years. Find \\ (I) Rate of Interest \\ (II) In what time it will be 243 times of itself? \end{tabular} \\ \hline 2 & \begin{tabular}{l} At what rate of compound interest per annum will a \\ sum of Rs. 1200 become Rs. 1348.32 in 2 years? \end{tabular} \\ \hline 3 & \begin{tabular}{l} An automobile financier claims to be lending money at \\ simple interest, but he includes the interest every six \\ months for calculating the principal. If he is charging \\ an interest of 10%, the effective rate of interest \\ becomes: \\ \begin{tabular}{llll} A. 10% & B. 10.25% & C. 10.5% & D. None of these \end{tabular} \end{tabular} \\ \hline 4 & \begin{tabular}{l} Reena took a loan of Rs. 1200 with simple interest for \\ as many years as the rate of interest. If she paid Rs. 432 \\ as interest at the end of the loan period, what was the \\ rate of interest? \\ \begin{tabular}{llll} A. 3.6 & B. 6 & C. 18 & D. Cannot be determined \\ E. None of these & & \end{tabular} \end{tabular} \\ \hline 5 & \begin{tabular}{l} E. None of these \\ A sum of money invested at Cl amounts to Rs. 2400 in \\ 3 years and 2520 in 4 years. Find the rate of interest per \\ annum? \end{tabular} \\ \hline 6 & \begin{tabular}{l} annum? \\ In how many years, a certain sum of money of Rs. \\ 1,53,600 amounts to Rs. 2,18,700, if the rate of interest \\ is 12.5% p.a.c.a.? \end{tabular} \\ \hline 7 & \begin{tabular}{l} A lent Rs. 5000 to B for 2 years and Rs. 3000 to C for \\ 4 years on simple interest at the same rate of interest \\ and received R.5. 2200 in all from both of them as \\ interest. The rate of interest per annum is: \\ \begin{tabular}{llll} B. 5% & C. 71/8% & D. 10% \end{tabular} \end{tabular} \\ \hline \end{tabular} \begin{tabular}{|c|c|} \hline 8 & \begin{tabular}{l} A sum of Rs. 725 is lent in the beginning of a year at a \\ certain rate of interest. After 8 months, a sum of Rs. \\ 362.50 more is lent but at the rate twice the former. At \\ the end of the year, Rs. 33.50 is earned as interest from \\ both the loans. What was the original rate of interest? \\ \begin{tabular}{llll} A. 3.6% & B. 4.5% & C. 5% & D. 6% \end{tabular} \end{tabular} \\ \hline 9 & \begin{tabular}{l} A certain amount earns simple interest of Rs. 1750 \\ after 7 years. Had the interest been 2% more, how \\ much more interest would it have earned? \\ \begin{tabular}{lll} A. Rs. 35 & B. Rs. 245 & C.Rs. 350 D.CND \end{tabular} \end{tabular} \\ \hline 10 & \begin{tabular}{l} The compound interest on a certain sum for 2 years at \\ 10% per annum is Rs. 525 . The simple interest on the \\ same sum for double the time at half the rate percent \\ per annum is: \\ \begin{tabular}{llll} A.Rs. 400 & B.Rs. 500 & C.Rs. 600 & D.Rs. 800 \end{tabular} \end{tabular} \\ \hline \end{tabular}