Assume that a country's outstanding external debt for the year is $900 million, its GDP for the year is $12 billion, its exports of goods and services for the year are $800 million, and its external debt service for the year is $150 million.

(1) Try to calculate the debt ratio, debt ratio and debt service ratio of the country. (Please keep the lower two decimal places in the calculation results)

(2) Do the debt ratio, debt ratio and debt service ratio of the country exceed their respective international warning standards?