Liangliang's father's monthly salary is 12,000 yuan, and his mother's monthly salary is his father's (9/10). How much is the total monthly salary of his father and mother?
亮亮的爸爸每月工资是12000元，妈妈每月的工资是爸爸的(9/10)，爸爸和妈妈每月工资共多少元？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">12_000 * (9/10)</gadget>
<output>10_800</output>

<gadget id="calculator">10_800 + 12_000</gadget>
<output>22_800</output>

<result>22_800</result>