A merchant has 1200 kg of sugar. He sells a certain quantity of sugar at a profit of �+25" id="MathJax-Element-114-Frame" role="presentation" style="position: relative;" tabindex="0">�+25�+25" id="MathJax-Element-245-Frame" role="presentation" style="position: relative;" tabindex="0">�+25�+25 $�+25$ $�+25$ $�+25$ (y+25)% and the remaining at a profit of �−20" id="MathJax-Element-115-Frame" role="presentation" style="position: relative;" tabindex="0">�−20 $�-20$ $�-20$ (y−20)% to achieve an overall gain of �+10" id="MathJax-Element-116-Frame" role="presentation" style="position: relative;" tabindex="0">�+10 $�+10$ $�+10$ (y+10)% on the entire quantity. Determine the amount of sugar sold at a profit of �−20" id="MathJax-Element-117-Frame" role="presentation" style="position: relative;" tabindex="0">�−20�−20" id="MathJax-Element-248-Frame" role="presentation" style="position: relative;" tabindex="0">�−20�−20" id="MathJax-Element-77-Frame" role="presentation" style="position: relative;" tabindex="0">[Math Processing Error]�−20" id="MathJax-Element-8-Frame" role="presentation" style="position: relative;" tabindex="0">�−20 $�-20$ $�-20$ $�-20$ $�-20$ $�-20$ (y−20)%.