There are a total of 27 coins of 1 jiao and 5 jiao in Xiao Ming's various piggy banks, and the ratio of the number of 5 jiao and 1 jiao coins is 4:5. How much money is there in Xiao Ming's piggy bank?
小明的诸蓄罐里有1角和5角的硬币共27枚，5角和1角硬币枚数的比为4：5．小明的储蓄罐中共有多少钱？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">27 / 9</gadget>
<output>3</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 0.5</gadget>
<output>6</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 0.1</gadget>
<output>1.5</output>

<gadget id="calculator">6 + 1.5</gadget>
<output>7.5</output>

<result>7.5</result>