How long did it take for Li Bing to create his irrigation channel?​

about seven years

Explanation:

The cracked rock was cleared away and the process started all over. It took about seven years to cut a channel through the rock.

Over 2,200 years ago, the city was threatened by the frequent floods caused by flooding of the Minjiang River (a tributary of the Yangtze River ). Li Bing, a local official of Sichuan Province at that time, together with his son, decided to construct an irrigation …

Explanation:

the amount of the purse is, $120.

tax rate =9%

first find the the total tax she paid on the amount is equal to the 9% of $120 i.e,

now,

total amount paid by shalika = $120 +$10.8 = $130.8

they forced them to b sell their land