Karan borrowed Rs. (7�+1800." id="MathJax-Element-246-Frame" role="presentation" style="position: relative;" tabindex="0">7�+1800.7�+1800." id="MathJax-Element-233-Frame" role="presentation" style="position: relative;" tabindex="0">7�+1800.7�+1800." id="MathJax-Element-61-Frame" role="presentation" style="position: relative;" tabindex="0">7�+1800.7�+1800." id="MathJax-Element-16-Frame" role="presentation" style="position: relative;" tabindex="0">7�+1800.7�+1800." id="MathJax-Element-9-Frame" role="presentation" style="position: relative;" tabindex="0">7�+1800.$7�+1800.$ $7�+1800.$ $7�+1800.$ $7�+1800.$ $7�+1800.$ $7�+1800.$ at 20% per annum simple interest for 3 years. He immediately invested the borrowed amount at 22% simple interest for 3 years and gained Rs. (3�−400" id="MathJax-Element-247-Frame" role="presentation" style="position: relative;" tabindex="0">3�−4003�−400" id="MathJax-Element-234-Frame" role="presentation" style="position: relative;" tabindex="0">3�−4003�−400" id="MathJax-Element-62-Frame" role="presentation" style="position: relative;" tabindex="0">3�−4003�−400" id="MathJax-Element-17-Frame" role="presentation" style="position: relative;" tabindex="0">3�−4003�−400" id="MathJax-Element-10-Frame" role="presentation" style="position: relative;" tabindex="0">3�−400$3�-400$ $3�-400$ $3�-400$ $3�-400$ $3�-400$ $3�-400$ . Find the interest received by Karan if he had invested the same amount at 10% per annum compound interest for 2 years.