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Not sure how many a rectagular prism douse have but a rectangular prism does have 8 vertices.
Real silver can have many different markings, ranging from 750 to 999- depending on the piece, common marks are : 800, 900, 925, 950. Or on bullion (bars, coins.) 999.
75% of 750= 75% * 750= 0.75 * 750= 562.5
52% of 750= 52% * 750= 0.52 * 750= 390
65% of 750 65% * 750 .65 * 750 487.5.