using sin & cos rules help please

I have this q, i have drawn the diagram for it but am unsure to how to sove it...

A tower 60m heigh stands on top of a hill. from a point on the ground at sea level, the angles of elevation of the top & bottom of the tower are 49degree and 37degree respectively. find the height of the hill.

I tried the hyp x =60/12 for the angles and found this for the height and tower but took 60 of for the tower, but i dont understand what i did ,but i also got the wrong answer:(

Thank you