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Robert's basic wage is $820. when he earns 3% of sales those are over $7000.

Robert Bryan Jr. earns $400 every week in adding to 3% of sales above $7,000 in overall. Whatever the Robert's weekly income if he sells $21,000?

Subtract that amount from Robert's sales to figure out how much robert could generate compensation off of first if he obtains 3% of revenues over $7,000 in the case.

$21,000 - $7,000 = $14,000

After that, multiply the number he could really make profit on by 3%:

14,000 x 3% = $420

The last stage is to increase his $400 weekly salary by his weekly commissions:

$420 + $400 = $820

Robert's weekly salary is $820.

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