Task 1 academic

The number of trees was 100.
The quantity of trees was 100.

The amount of water used was 100 litres.

The rate of water usage was 15 per cent. The proportion of water usage was 15%. The water usage was fifteen per cent

The water usage increased by 15 percent.
The percentage of water usage (15%) and power usage (16%) were about the same.
The water usage and power usage were 15% and 16%, respectively.