साधारण ब्याज की दर \( 8 \% \) से घटकर \( 7 \frac{1}{2} \% \) हो जाने से एक महाजन की वार्षिक आय मे 65 रूपया की कमी आ गयी तो महाजन ने कितना रूपया ब्याज पर उधार दिया था?

Find the compound amount and the amount of interest earned by the following deposit. \( \$ 5800 \) at \( 3.5 \% \) compounded continuously for 7 years. The future value after 7 years is approximately \( \$ \square \) (Do not round until the final answer. Then round to the nearest cent as needed.)

During a sale, a shop offered a discount of \( 10 \% \) on the marked prices of all the items. What would a customer have to pay for a pair of jeans marked at \( \bar{₹} 1450 \) and two shirts marked at ₹ 850 each?

Find the selling price if the cost of a certain accessory is Rs 1520 . 4. The cost price of a certain novel is Rs 1,100 . Find selling price of the novel at \( 66 \% \) markup rate. 5. A Mobile Phone company uses a markup rate of \( 55 \% \) on the cost of each mobile phones that cost Rs 2,260 . Find the selling price of the mobile phone. A mobile phone company uses a \( 45 \% \) markup rate. Find the cost of a unit that sells for Rs 4785 . 7. The markup rate on the selling price of a calculator that is Rs 1,230 is \( 50 \% \). Find the cost price of the calculator. A stationer uses a markup of \( 60 \% \) on each item that he sells. Rs 144 . Find the cost price of the item.

अरविन्द ने एक धनराशि 1 जनवरी, 2012 को बैक मे \( 8 \% \) वार्षिक साधारण ब्याज की दर से निवेश की, उसे 3,144 की धनराशि 7 अगस्त, 2012 को बैंक से प्राप्त हई। उसने कितनी धनराशि बैंक में निवेश की थी?

Find the compound amount and the amount of interest earned by the deposit below. \( \$ 3,000 \) at \( 3.89 \% \) compounded continuously for 4 years. What is the compound amount? \( \$ \square \)