Question 50095
Plan A: A salary of $500per month plus a commission of 4% of total sales
Plan B: A salary of $750 per month plus a commission of 5%of total sales over $8000
For what amount of sales is Plan B better than Plan A, assuming that total sales are always more than $8000? 

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Let total sales be 8000+x
Plan A will pay 500+0.04(8000+x)=320+0.4x
Plan B will pay 750+0.05x
INEQUALITY:
When is Plan B pay greater than Plan A pay?
750+0.05x>320+0.04x
430>-0.01x
x>$43,000
Plan B pay is greater when total sales is at least 8000+43000=$51,000

Cheers,
stan H.