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  • https://math.libretexts.org/Courses/Las_Positas_College/Foundational_Mathematics/07%3A_Percents/7.S%3A_Percents_(Summary)
    The percent the amount of decrease is of the original amount If an amount of money, P, the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I, earne...The percent the amount of decrease is of the original amount If an amount of money, P, the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I, earned is I = Prt. Mark-up: The mark-up is the amount added to the wholesale price, determined by the mark-up rate. If an amount of money, P, the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I, earned is I = Prt
  • https://math.libretexts.org/Courses/Nova_Scotia_Community_College/MATH_1043/01%3A_Numerical_Literacy/1.06%3A_Percents/1.6.S%3A_Percents_(Summary)
    The percent the amount of decrease is of the original amount If an amount of money, P, the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I, earne...The percent the amount of decrease is of the original amount If an amount of money, P, the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I, earned is I = Prt. Mark-up: The mark-up is the amount added to the wholesale price, determined by the mark-up rate. If an amount of money, P, the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I, earned is I = Prt
  • https://math.libretexts.org/Bookshelves/PreAlgebra/Prealgebra_2e_(OpenStax)/06%3A_Percents/6.08%3A_Exercises

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