A salesman earns a base salary plus commission. When he sells uunits, he earns ddollars, as shown in the equation. What is the value of uwhen dis 390?

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A salesman earns a base salary plus commission. When he sells uunits, he earns ddollars, as shown in the equation. What is the value of uwhen dis 390? <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04222.png'/><!--<m:math display='block' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>d</m:mi><m:mo>=</m:mo><m:mn>110</m:mn><m:mo>+</m:mo><m:mn>40</m:mn><m:mi>u</m:mi></m:mrow></m:math>-->