Last year, the total output of vegetables in a township was 7.2 million Jin, an increase of 20% over last year. What is the total output of green vegetables this year?

720×( 1+20%)

=720× 120%

= 8.64 million kg

⑵ A factory used 5400 tons of water in the second half of April, saving 20% compared with the first half. How many tons of water were used in the first half of the year?

5400÷( 1-20%)

=5400÷80%

=6750 tons