Decorate a bedroom with a length of 4 meters and a width of 3 meters. The master worker wants to lay a kind of floor tile inside. This kind of floor tile covers 1 square meter every 4 pieces, and the price of each brick is 45 yuan. How much floor tiles should I buy at least for this bedroom?
装修一间长4米，宽3米的卧室．工人师傅要在里面铺一种地砖，这种地砖每4块铺1平方米，每块砖售价45元，这间卧室至少要买多少钱的地砖？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 * 45</gadget>
<output>2_160</output>

<result>2_160</result>