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**XxXScorpionXxX** Question as is

Suppose the marginal cost is C'(x) = e^{-0.9x}, where x is measured in units of 400 items and the cost is measured in units of 1,000 . Find the cost corresponding to the production interval [1,200, 1,600]. Round to the nearest dollar.

Okay so the boundary is from 1.2 to 1.6 since its measured in 1000's of units.

e^{-0.9x / -0.9
I can factor out 1/-0.9 which simples to -1.1 and then I... plug in 1.2 into x and do the same for 1.6 and add the area of the two and multiply by 400? }