Cities must find better ways to dispose of solid waste

Cities must find better ways to dispose of solid waste. According to the Environmental Protection Agency, the composition of the 217 million tons of solid municipal waste created in 1997 was 

Paper and paperboard 38.3%

Yard waste 12.3%

Food waste 10.0%

Plastics 10.0%

Metals 7.7%

Other materials none

What percentage of the total solid waste is paper or paperboard? 
What percentage is from the top two categories? 
What percentage is from the top five categories?