Python 入门教程 2 ---- Tip Calculator

 第一节

    1 把变量meal的值设置为44.50

    #Assign the variable meal the value 44.50 on line 3!
    meal = 44.50

    1 把变量tax的值设置为6.75%     

    meal = 44.50
    tax = 6.75/100

 第三节

    1 设置tip的值为15%   

    #You're almost there! Assign the tip variable on line 5.
    meal = 44.50
    tax = 0.0675
    tip = 0.15

 第四节

    1 把变量meal的值设置为meal+meal*tax

   #Reassign meal on line 7!
   meal = 44.50
   tax = 0.0675
   tip = 0.15
   meal = meal+meal*tax

 第五节

    1 设置变量total的值为meal+meal*tax

     #Assign the variable total on line 8!
     meal = 44.50
     tax = 0.0675
     tip = 0.15
     meal = meal + meal * tax
     total = meal + meal * tip
     print("%.2f" % total)