Clarification on Taxation of Stock Selling

I have a query regarding taxation of stocks if you can help clarify.

Suppose i had purchased 100 qty of a stock, s1, on 01-may-2015 at Rs. 1500. Let us say on 01-Jul-2015 the company has announced 1:1 bonus. On 01-aug-2015, its price was 2000 and on that same day 100 qty got credited, and hence its price got halved to 1000. On 01-sep-2015, price was 1100 and i sold the first 100 shares at 1100

Question 1
for the first 100, my acquisition price was 1500 and selling price was 1100. am i right if i say that this transaction is a loss STCG transaction ?. if so, do i have to book loss in the IT return for AY-2016-17 ?

Question 2
if the above is correct, and let us say if i made STCG profit in another stock s2, is the resultant profit the difference between the profit of s2 and loss of s1 ? and if so, will STCG be applied on difference only ?

Question 3
as per rule is it right that the 100 that got credited as bonus will have a acquisition price of ZERO ?