求助！根据这段英语新闻问题提问2个问题和正确回答

Question

The value of Chinese currency Renminbi (RMB), the yuan, weakened 30 basis points against U.S. dollars Wednesday.

The central parity rate was set at 6.5736 per U.S. dollar Wednesday, comparing 6.5706 per U.S. dollar the previous trading day, according to the China Foreign Exchange Trading system.

China's central bank announced on June 19 last year that it would reform the yuan exchange rate formation mechanism to improve its flexibility.

On China's foreign exchange spot market, the yuan can rise or fall 0.5 percent from the central parity rate each trading day.

The central parity rate of the RMB against the U.S. dollar is based on a weighted average of prices before the opening of the market for each business day.

请各位帮帮忙

Answer 1

1. How to calculate the central parity rate of RMB against the US dollar?
The central parity rate of the RMB against the U.S. dollar is based on a weighted average of prices before the opening of the market for each business day.

2.Why should China's central bank reform the yuan exchange rate formation mechanism?
Current Chinese exchange rate is stable rather than floating with US dollar. With the depreciation of US dollar, there is a sharp rise of the RMB, which will damage the Chinese exporting.

Answer 2

what didi China's central bank announce?
answer: it would reform the yuan exchange rate formation mechanism to improve its
flexibility.
what percent can the yuan rise or fall from the central parity rate each trading day?.
answer: 0.5 percent