1. By drawing a straight line on both sides of the figure, we can see that by 'covering' the area on one side to the other; and divide the figure into 4 equal parts; the shaded area is approximately 3/4 of the figure and hence the answer is 75%.

2. 334 x $59.95 is the exact total but since we need only 2 significant figures, we need only

334 x $60 or simply

300 x $60

which gave us $18000 as an estimation to 2 significant figures.

Thanks