Rekha and Sonali received Rs.2800 as wages for 20 days for the work they did together. Rekha’s efficiency in the work was three times that of the Sonali. What are the daily wages of Sonali?

If tan (θ_{1} + θ_{2}) = √3 and sec (θ_{1} - θ_{2}) = 2/√3 , then the value of sin2θ_{1} + tan3θ_{2} is equal to (assume 0°< θ_{1} - θ_{2} < θ_{1} + θ_{2} < 90°