2560=100%
x =15% = 2560×15÷100=384
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4580=100% x =20% = 4580×20÷100= 916
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7200=100%
x =15% = 7200×15÷100= 1080
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6420=100%
x =30% = 6420×30÷100= 1926
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5050=100%
x =35% =5050×30÷100= 1515
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3010=100%
x =16% = 3010×16÷100= 481.6
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