b) A new car is equipped with three fuel saving devices. Device A by itself saves 40% on fuel; device B by itself saves 35% on fuel; and device itself saves 25% on fuel. Now suppose that the three devices are used together and that they act independently. Will the combination save 40+35+25=100% on fuel?
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Fuel-saving devices are sold on the aftermarket with claims they may improve the fuel economy, the exhaust emissions, or optimize ignition, air flow, or fuel flow of automobiles in some way. An early example of such a device sold with difficult-to-justify claims is the 200 mpg‑US (1.2 L/100 km) carburetor designed by Canadian inventor Charles Nelson Pogue.
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