500 - 40% = 499.6
300 is 40% less than 500.
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40 divided by 500=80
40 - (20%) = 32
540.00 - (40%) = 324.00
20 % of minus 200 dollars is minus 40 dollars.
it will be (30*300/100)-(40*400/100)+(50*500/100)=500. hope it will help.