x ltd. undertook a contarct to contract a building for rs.3 cr. on 1st sep,11 . on 31st march,12 the co. found that it had already spent  rs. 1 cr 80 lakhs on the constrution . prudent estimate of additional cost for completion was rs 1 cr. 40 lakh. . what amt should be charged , to revenue in the final accounts for the year ended on 31st, 2012 , as per the provisions of accounting stndrd 7 " constution contract revised" ???

in this i m not abl?e to find the degree of completion..??/