Math 035 Chap 7
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Percent as decimal
 move decimal to the left
 {ex. 0.026 = 0.0026}
 move from right to left if number has no decimal
 {ex. 526% = 5.26}

Decimal to percent
 move decimal right
 {ex. 0.954 = 95.4%}
 move decimal from left to right if number has no decimal
 {ex. 705 = 70,5000%}
 any additional zeros can be dropped
 {ex. 0.0063 = 0.63%}
be sure to
add %

Percent as a fraction or mixed number
 make percent a fraction over 100
 {ex. 15% = 15/100}
 Simplify fraction is possible
 {ex. 15% = 15/100[divide both sides by 5] = 3/20}
 if percent is converted and fraction is improper, convert fraction to a mixed fraction and simplfy if possible
 {ex. 725% = 725/100= 7 25/100 {divide both sides by 25] = 7 1/4}
 if percent is a decimal, move decimal but add same number of zeros in demominator
 {ex. 1.45% = 1.45/100 = 145/10000 [divide both sides by 5] = 29/2000}

Fraction to percent
 use long division then convert decimal to percent ( moving to right)
 {ex. 6/25 = 25/6(divide) = 0.24(move decimal) = 24%}

Solving Equation
is/of = %/100

Simple Interest
I = p*r*t
 p = principle
 r = rate of interest ( decimal)
 t = time in years
 I = interest

Tax
 tax = taxrate * subtotal (decimal)
 subtotal = cost + tax

Commission
commission = total sales * commission rate (decimal)

Discount
 discount = price * discount rate (decimal)
 sales price = original price  discount