Cannon Precision Instruments makes an automatic electronic flash with Thyrister circuitry. The estimated marginal profit associated with producing and selling these electronic flashes is P'(x) = -0.0025 x + 20

dollars per unit per month,when the production level is x units per month. Use geometry to calculate the definite integral, determining the change in profit over the sale of the first 8000 electronic flashes. The graph of the marginal profit is provided for your use.