Xiao Ding Ding went to the store to buy clothes. The original price of a piece of clothing he chose was 430 yuan. At this time, the mall was carrying out a buy-one-get-one-free campaign (buy one at the original price and get another cheaper one for free), so Xiao Ding Ding picked another 320. Pants, and in the second month, the store adopts a preferential method of 99 minus 199. Which method is more cost-effective for Xiao Ding Ding to choose? How much is the difference between the two purchase methods?
小丁丁到商店买衣服，他选中的一件衣服原价430元，这时商场进行买一送一活动(原价购买一件则赠送另一件较便宜的)，所以小丁丁又挑了一条320的裤子，而第二个月，该商店采用满199减99的优惠办法．小丁丁选择哪种方法比较合算？两种购买方法相差多少钱？
<gadget id="calculator">320 + 99</gadget>
<output>419</output>

<result>419</result>