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
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 。
算到最后可以代答案进去,这样快一点
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