Wat is the apparatus used to measure mass and volume

The simple interest on a loan of $200 at 10 percent interest per year is $10 per year until the loan is paid off. $15 per year until the loan is paid off. $20 per year until the loan is paid off. $25 per year until the loan is paid off.

Blank liquids and gases exert a buoyant force on objects placed in them

Which one of the following research methods can show cause and effect