Please, help me translate this sentence

According to an estimation, a Goods and Services Tax rate of a single percent represents over 7 billion dollars of income. In other words, by imposing a GST of about 4-5%, the government can correct the total income from all land auctions. That relieves the government's concern about the instability of over-reliance on land sales revenue as its main source of income.

你的英文很好
那裡學習的?

In estimate, per every percent increase on the sales tax, the treasury increase by 7 billion dollars. In any other word, 4%-5% sales tax raised is equivalent to the total revenue collected through land sales. Hence, the government’s concern in regards to inconsistent income caused by over dependent on land sales no longer exists.