To order certain plants from a catalog, it costs $3.00 per plant, plus a 5 percent sales tax, plus $6.95 for shipping and handling regardless of the number of plants ordered. If Company C ordered these plants from the catalog at the total cost of $69.95, how many plants did Company C order?


22

21

20

19

18

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题目分析：订购某种植物，每株3块，并加上5%的销售税，额外还有6.95块的运费等，运费是固定的，不随购买株数而改变。问，已知该公司订购这种植物总共花了69.95块，那么总共订购了多少株？
解答：方程求解比较简单直观，设共订购x株 3x+3x*5%+6.95=69.95  求解得x=20 。

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