The next two rules, Price and TotalPrice, are similar to the previous rule.

接下来的两条规则，Price和To talPrice，类似于上一条规则。

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These binds perform the calculations for the Subtotal and Totalprice fields (see figure 15).

这些绑定执行Subtotal和Totalprice字段的计算公式（参见图15）。

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The other field of Cart that the client is interested in is the totalPrice, representing the sum total of everything in the shopping cart.

客户对Cart感兴趣的其他字段是totalPrice，它代表购物车中所有商品的金额汇总。

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The other field of Cart that the client is interested in is the totalPrice, representing the sum total of everything in the shopping cart.

客户对Cart感兴趣的其他字段是totalPrice，它代表购物车中所有商品的金额汇总。

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