There are about 75brands of microwave popcorn on the market; altogether, they account for a little over half of the money from sales of microwave food products. It takes three minutes to pop corn in the microwave, compared to seven minutes to pop corn conventionally. Yet by weight, microwave popcorn typically costs over five times as much as conventional popcorn. Judging by the popularity of microwave popcorn, many people are willing to pay a high price for just a little additional convenience.
23. If the statements in the passage are true. Which one of the following must also be true?
(A) No single brand of microwave popcorn accounts for a large share of microwave food product sales.
(B) There are more brands of microwave popcorn on the market than there are of any other microwave food product.
(C) By volume, more microwave popcorn is sold than is conventional popcorn.
(D) More money is spent on microwave food products that take three minutes or less to cook than on microwave food products that take longer to cook.
能帮我解释一下黑体字的意思么？
出卖它们而得之收入占微波炉食品销售总额的50%多(但只是略微多于50%)
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