You are getting ready for school and have to choose what shirt to wear. You have 4 styles of shirts: short-sleeved, long-sleeved
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If the bacteria is tripling every 10 minutes, that means the "rate of increase" on that period is 200%, so if say the current amount is "c", 200% of "c" is just 2c, so c + 2c is 3c, a tripled amount.
