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The matrix below shows the selling price (in USD) of three snack packs S1,S2 and S3 at two vending machines A and B.
A student club places an order of 50 of S1, 80 of S2, and 40 of S3.
Write down a matrix equation for the total revenue vector R (2×1) from each machine.
Hence calculate the total revenue from vending‑machine A and from vending‑machine B.
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