Only percentage is mentioned in the question... The one more required data is number of total shirts given for sale.
If we assume the given shirts would be 100, 91 shirts were sold.
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sell = cost + cost x 250% = cost x 350 % → cost = sell ÷ 350 % = 315 ÷ 350 % = 90
Here is a trick for figuring out perctages. Put your figures like this: mulitply 18 x 100 = 1800 then divide that by 5 then you will have the number of boxes the troop sold. 56 (I did that in my head so check on the calculator)
Amy 7 Judy 5
40
The theater sells child and senior tickets for $3, and other tickets for $6.50. The theater sold 445 tickets and collected $2,518 from it. How many of each ticket did the theater sell?