Help me with these questions And I want answers are correct

Help me with these questions >.< And I want answers are correct, thank you so much!

Solution

Answer to 1st questions :15 million units(Explanation: whensubsidy is given, supply curve will shift rightward and new equlibriumquantity will be 6 million ant price is $3. Then, CS = ($5 x 6) / 2 = 15)

Answer to 2nd questions : $12.5 (Explanation: ($5 x 5) / 2)

Answer to 3rd questions : $7.5 (Explanation: ($3 x 5) /2 )