Question

Q4. An alloy consists of 7 parts of zinc and 33
parts of copper. Find the percentage of copper in
the alloy
Q5. The price of a shirt decreased from Rs.80 to
Rs.60, find the percentage of decrease in price if
the shirt.
Q6. Rohan brought a calculator for Rs.760 and
sold it for Rs.874. Find his profit and profit
percentage.
Q7. Find the time when simple interest on
Rs.2500 at 4% per annum is Rs.200.​

Answer 1

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An alloy is a combination of metals or metals combined with one or more other elements. For example, combining the metallic elements gold and copper produces red gold, gold and silver becomes white gold, and silver combined with copper produces sterling silver.