Xiao Cong donated his pocket money to the schools in the earthquake-stricken area. After counting, there are 3 pieces of 10 yuan, 8 pieces of 1 yuan, 5 pieces of 1 dime, and 7 pieces of 1 cent. How many yuan are there in total?
小聪把自己所存的零用钱捐给了地震灾区的学校．数了数共有3个10元，8个1元，5个1角，7个1分，这些钱共有多少元．
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">1 * 8</gadget>
<output>8</output>

<gadget id="calculator">0.1 * 5</gadget>
<output>0.5</output>

<gadget id="calculator">0.01 * 7</gadget>
<output>0.07</output>

<gadget id="calculator">30 + 8 + 0.5 + 0.07</gadget>
<output>38.57</output>

<result>38.57</result>