Answer:
Most likely, you will not be doing integrals as part of your daily life, but knowing how integrals work, can help you understand how some things work. Foir example, the interest earned on an interest bearing account (like a savings account) when compounded daily, is close to the value for 'continuous compounding'. The rate curve represents the interest earned at a particular time, and the area under the curve (the integral of the function) represents the total accumulated interest.