Xiao Ding Ding’s family paid a total of 1,800 yuan in water bills last year. This year, they plan to save an average of 15 yuan a month compared with last year. Based on this calculation, how much is the total water bill expected to be paid this year?
小丁丁家去年共缴了1800元水费，今年准备平均每月比去年节省15元，照这样计算，今年预计一共要缴多少元水费？
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">1_800 - 180</gadget>
<output>1_620</output>

<result>1_620</result>