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$1.35
This is a problem that people face every day. If you spent 10% of your money on food last year and 20% of your money on food this year, how much did your spending on food increase as a percentage of your money? You solve this problem the same way you find any other change percentage: subtract the old value from the new value and divide that number by the old value. So, (20%-10%)/10% = 100%. The percentage of your money that you spend on food has increased 100% over last year.
The common multiples of 2 and 5 to 100 are: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
To a power of 10 (to 10, 100, 1000, etc.).
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