1)The population of a country Dnalgne is 50 million in 1997 and increasing at a rate of 0.6 million per year. The average annual income of a person in Dnalgne during 1997 was 24000 dollars per year and increasing at a rate of 900 dollars per year.

How quickly was the total income of the entire population rising in 1997?

______dollars per year

2)The number of trees in a forest is 100 million in 1997 and increasing at a rate of 0.3 million trees per year. The total mass of wood in the entire forest at the start of 1997 is610^10

kilograms. In 1997 the total mass was increasing at a rate of 6 % per year.

(a)What is the average mass of a tree in 1997?

_____kilograms

(b)Is this average increasing or decreasing?

A.decreasing

B.increasing

(c)How quickly?

____kilograms per year