What is the selling price of an item if the original cost is $784.50 and the makeup on the item is 6.5%

I think what you meant to type is "markup". If the markup is 6.5%, we need to increase the cost by that amount. To find 6.5% of a number we convert it to a decimal,.065, and we add 1.00, to get 1.065. The 1, when multiplied, gives us the original amount, and the. 065 gives us the additional amount. We multiply that by 784.5. 784.5 x 1.065 = 835.49. The other way to do it is to just multiply by 0.065, and you get 784.5 x 0.065 = 50.99, then add it to the original amount, 784.5 + 50.99 = 835.49.

7.84.50 (1.056) = 835.49