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SakerTooth
Well it's repeated addition of 15% three times which is the same as 15% * 3 which is 45%. Which Is the reason why 15% of 15% of 15% relates to 45% of 500.
tracycherry
"Of" means times (multiplication).  15% of 500 is 75.  15% of 75 is 11.25.  15% of 11.25 is 1.6875.  45% of 500 is 225.  

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