if a soccer club buys 10 New Jerseys for €500 and sells them for one for €85 per jersey how much profit did they save in percentages

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?