The marginal cost of drilling an oil well depends on the depth at which you are drilling; drilling becomes more expensive, per meter, as you dig deeper into the earth. Let C (x) be the marginal cost, in rands per meter, with x the depth, in meters. If the marginal costs are a rands up to a depth of 900 meters and increases at a constant rate of b rands per meter after a depth of 900 meters, 1.1 Write down a formula for C' (x) if x e (900, o). 1.2 Find the variable cost of increasing the depth of an existing well from 900 to 1750 meters.

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