(1) Increase in wheat yield=2400/700=24/7=343% or an increase of 243%.
(2) Concentration changes to 800×0.00005=0.04ppm.
(3) If the reduction rate is r% per year then over 2001-1977=24 years, we have 543.776(1-r/100)²⁴=201.182, (1-r/100)²⁴=201.182/543.776=0.37 approx.
1-r/100=0.9594, r/100=0.0406, so percentage decrease per year on average is 4.06% approx.
(4) 150,000,000 lb over 163,707 sq miles=150000000/163707=916.27lb/sq mile.
(5) Assume 12.2 miles is intended to be 12.2 square miles. Between 2007 and 2008, 104 batches of medflies were released=156,000,000 medflies in all.
156000000/12.2=12.79M medflies/sq mile.
(6) 1.2M shipments is equivalent to 50M tonnes.
One shipment is equivalent to 50/1.2 tonnes=41.67 tonnes approx.
1 tonne=1000kg=2202.64lb approx.
Only 1% of each shipment is tested=0.4167 tonne=917.77lb.
41.67 tonnes=91776.74. Therefore 91776.74-917.77=90,859 lb (approx) pollutants not inspected per shipment.