answer: the bar contains 7.578 ounces of silver.
ounce is the unit of mass, weight or volume of certain solids or that are used as a measuring constant in britain and usa. "one ounce" is equal to 28.35 grams. the size of one ounce will be equal to liquid in 1inch diameter sauce cup.
93% of the bar is silver,
weight of the metal bar = 8.15 ounces
93% of the metal bar = = 7.5795 ounces
rounding to nearest thousand = 7.578 ounces.
verify the options you will get the answer