Guidance Value Registration

Q: have some doubts regarding the property I am buying :

Background : Guidance Value of the area is 2130/- per sqft , but my actual sale cost is Rs 3500/- per sqft . I am planning for a 6th floor apartment (Area :1340 sqft). Its a ready to move in property and only amenities is being installed in the property as of now .
Car Parking : Rs 200000
Amenities: 1,50,000

Questions :

a) Will the Stamp Duty,Registration be calculated on the Actual Sale Cost or the Guidance Value
b) What % of the total cost of amenities will be used to calculate the Stamp Duty and Registration .
c) Will aspects like (Electrical Works/Advance Maintenance/Cost Of Power Backup) be a part of amenities .
d) As this is Ready to Move in Property (all blocks are completed except for landscaping and some amenities) , is the builder correct to charge Service Tax and VAT for the same .

Requesting your views on the same .