* Plant A emits 2000 tons of mixed gases annually * Plant A emits 400 kg of CO annually * RA 8749 emission standard is 0.3 kg CO/ton of mixed gases * To calculate Plant A's emission rate: ** 400 kg CO / 2000 tons mixed gases = 0.2 kg CO/ton mixed gases * Plant A's emission rate is below the standard of 0.3 kg CO/ton and is therefore compliant * Plant B emits a quarter of what Plant A emits ** A quarter of 2000 tons is 2000 * 0.25 = 500 tons * Plant B emits 250 kg of CO annually * Plant B's emission rate is: ** 250 kg CO