Adding and multiplying percents

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  1. One video game is $25 before 12% sales tax. How much is 4 video games after tax?
    1. When Kim was in grade 5, she was 130 cm tall. In grade 6, she was 20% taller than last year. In grade 7, her height has increased by 15%.
      1. How tall was Kim when she was in grade 7?
      2. Did Kim's height increase by 35% from grade 5 to grade 7? Explain.
    2. A bank pays a compound interest of 5% to any account with $10000 annually. How much will be there in an account with $10000 after 3 years?