Hello I need your help as soon as possible with this excercise. I tried to do it many times but for me it seems to be impossible (few data?) But I want to ask you if you see maybe a solution.

Demand function:
Qs = ((200-2*Ps)(Pt-Pu))/(10*I)

Data:
Four days ago:
price for S was 45 $.
For good T was 25 $
for a good U was 10 $.
Income was 10 $.

Calculate:
- Price elasticity of the demand for good S four days ago.
- Income elasticity of the demand for good S four days ago.
- cross elasticity of the demand for good S in relation to prices of goods T and U.