When buying on credit you have to borrow money to pay for the object meaning you will have to pay more for it due to the interest on the loan. Let the rate at which the interest is levied is equal to R per annum per year. Easy to use on mobile as well.
As a general rule it is not wise to buy items on credit.
Simple interest is worked out by calculating the percentage amount and multiplying it by the number. Get your calculator and check to see if youre right. Simple online browser based javascript simple interest calculator. To calculate the amount of simple interest over 5 years you simply multiply the interest earnt in year one by five - 125 5 625.