Simple Interest and Discount?

PackardBell

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1. Mr. Black plans to buy a Computer set from ABC company, which is offered for 6500 cash or 6700 cash if paid at the end of 3 months. If money were worth 7 percent, how much would Mr. Black save by borrowing the money and paying cash to it?

2. An interest of 870 cash was earned by Ms.Ford in 8 months on an investment at 9 percent. How much was invested?

Solutions please :)) TY
 
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