a pet store buys bags of dog food for 30.00 dollars per bag and sells them for 54.00 dollars per bag. What is the percent markup
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What we have here is a problem of proportions. We're assuming that the probabilities - the ratio of rainy days to total days - are equal; 3 is to 20 as <em>something</em> (let's call it <em>r </em>for "rainy days") is to 365. Mathematically, that gives us this equality:
To solve for <em>r</em>, we can simply multiply either side of the equation by 365:
365 and 20 have the factor 5 in common, so we can use that to reduce the fraction to:
So, the number of rainy days, if that pattern continued, would be around 54 3/4 days, or 55, rounded up to the nearest day.
To solve for <em>r</em>, we can simply multiply either side of the equation by 365:
365 and 20 have the factor 5 in common, so we can use that to reduce the fraction to:
So, the number of rainy days, if that pattern continued, would be around 54 3/4 days, or 55, rounded up to the nearest day.