The school needs to buy 24 basketballs. The kind of basketball Mr. Wang chose is sold in Renmin Shopping Mall and Lianfu Shopping Mall. There is a "buy 5 get 1 free" campaign for this kind of basketball in the Fu shopping mall. Which shopping mall Mr. Wang can buy is cheaper and how much is the least?
学校要买24只篮球，王老师选中的一种篮球在人民商场和联富商场都有销售，且两家商场这种篮球的标价是78元，在人民商场购买可以享受七五折优惠，而联富商场这种篮球正在搞"买五送一"活动，王老师到哪个商场购买比较便宜，最少要多少元？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">24 / 6</gadget>
<output>4</output>

<gadget id="calculator">4 * 5 * 78</gadget>
<output>1_560</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">78 * (3/4) * 24</gadget>
<output>1_404</output>

<gadget id="calculator">1_560 - 1_404</gadget>
<output>156</output>

<result>156</result>