Ben sold a painting to Carl at a profit of 20%, and Carl then sold it to Don at a profit of 40%. Don paid $12 800. Calculate how much Ben paid for the painting.[2]
Some bacteria were introduced into a culture. The number \(N\) of bacteria after \(t\) hours is \(N=2\times5^t\). Find the increase after 5 hours as a percentage of the number originally introduced.[2]
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