When calculating interest accrued you should?

The correct answer is APR, which stands for Annual Percent Rate. This is the percent rate for the amount of money that you owe for that year only in interests. It comes as a bonus over the loan and usually the banks have you pay the interest before you pay the loan because banks give money to others based on the interest that you pay, and the circle goes on and on.

Earn positive economic profit in the long run if it can maintain barriers to entry, assuming no changes in costs or market demand