3% on 420 = 420*3/100 = 12.6 per year.
That is equivalent to 1.05 per month.
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If you mean 5.8% annual interest rate compounded monthly, then (1000*.058)/12 = 4.83
The simple interest over a period of five years is $463.70
Simple interest is the interest you earn on your principal, IE the amount of your original investment. For example, you put 1000 dollars in a saving account paying 3% per annum. At the end of the year you will have earned 30 dollars on that one thousand dollars. If you leave the principal and interest in the account for another year you will earn another 30.00 on your original 1000 dollars plus .90 interest. on the first 30.00 dollars interest. This gives you a total of 1060.90 in your second year. In each succeeding year you will earn interest on your interest plus interest on your original principal which, if left alone will add up to a substantial some given the power of compound interest. One caveat, compound interest is a double edged sword. If you have a loan and fail to make your monthly payments on time, compound interest will gut you financially.
sue will bugget 1.25 of her 50 monthly allowance if he follow the advice he is given of saving 2.5 of the amount.If someone saves 2.5 percent of $50 it would be $1.25. To solve this multiply the amount of the allowance by the percent, so 50 multiplied by .025.
178.50 saving 31.50