math problem

1.A man solid a car for $35000 at a loss of 30% on the cost price. What would have been the loss or gain percent if he has sold it for $50500.
A. A gain of 10%
B. A gain of 1%
C. A loss of 10%
D. A loss of 1%

2. 1/(1/sinθ - 1) - 1/ (1/sinθ + 1 ) =
A. 2 tanθ
B. 2 tan^2 θ
C. 2/ tan^2 θ
D. 2sinθ/ cos^2 θ