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Percentages (Compound Interest (Increase) (Amount x Multiplier(power=numbe…
Percentages
Increase
Amount x Multiplier
£250 increased by 30%
100%+30%=130%=1.30
Decrease
Amount x Multiplier
£112 decrease by 15%
100%-15%=85%=0.85
Reverse (Finding Original) (Increase)
Original=New Price/Multiplier
New Price=£350 after 12% Increase
100%+12%=112%=1.12
Reverse (finding original)(Decrease)
Original Price=New Price/Multiplier
Sale Price=£120 after 20% Decrease
100%-20%=80%=0.8
Compound Interest (Increase)
Amount x Multiplier(power=number of years
Invest £10,000 12.5% interest rate
Years=4
100%+12.5%=112.5%=1.125
10,000 x 1.125 (to the power of 4)
Compound Depreciation (Decrease)
Amount x Multiplier (power=no of years)
Car Cost £25,000 Depreciation At 10%
year=6
100%-10%=90%=0.9
25,000 x 0.9 (power of 6)
Percentage Of Amount
Multiplier x Amount (Total)
20% of 153