Question

Pennies used to be made of copper and zinc and had a mass of 3.1g today pennies are made of copper plated zinc and have a mass of 2.5 G. A new pennies mass is what percent of an old pennies mass?

Answer 1

2.5/3.1 = 0.806451612903226 %

Answer 2

The new pennies mass is 80.65 percent of an old pennies mass.

Explanation:

Consider the provided information.

Pennies used to be made of copper and zinc and had a mass of 3.1g

Today pennies have mass of 2.5 G.

We need to find a new pennies mass is what percent of an old pennies mass.

Use the formula of percentage:

`(Part)/(Whole)=(\%)/(100)`

Substitute the respective values in the above formula.

`0.8065=(x\%)/(100)`

`80.65=x\%`

Hence, the new pennies mass is 80.65 percent of an old pennies mass.