Answer:
The new pennies mass is 80.65 percent of an old pennies mass.
Step-by-step 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:
[tex]\frac{Part}{Whole}=\frac{\%}{100}[/tex]
Substitute the respective values in the above formula.
[tex]0.8065=\frac{x\%}{100}[/tex]
[tex]80.65=x\%[/tex]
Hence, the new pennies mass is 80.65 percent of an old pennies mass.
