The bank stipulates that the purchase of the first house will charge interest at 30% of the original loan interest. Therefore, Mr. Li can pay less interest of 255 yuan per month. If the original loan interest is charged, how much should he repay the interest every month?
银行规定，购买首套房的按原贷款利息的7折收取利息．因此，李老师每月可以少还利息255元．如果按原贷款利息收取，他每月应还利息多少元？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">225 / (3/10)</gadget>
<output>750</output>

<result>750</result>