Master Wang charges 90 yuan per hour for excavating soil with an excavator, and helps the school dig sand pits. It starts at 9:00 am and ends at 10:20 am. Please help the school calculate how much salary the school should pay Master Wang? Use your brains, I believe you can have a good way to solve this problem.
王师傅用挖土机挖土每小时收费90元，帮学校挖沙坑，从上午9：00开始，到上午10：20结束，请你帮学校算一算应付给王师傅多少元工资？动动脑筋，相信你能有好办法解决这个问题．
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/3) * 90</gadget>
<output>120</output>

<result>120</result>