Composite supply

then whole bundle shall be exempt 

Exempt whole

Whole supply will be exempt.

It will be considered as wholly exempt

As per the Provision of Section 8 of the CGST Act 2017 i.e. "TAX LIABILITY ON COMPOSITE and MIXED SUPPLY" :

(a). A Composite Supply comprising two or more supplies, one of which is a PRINCIPAL Supply, shall be treated as a supply of such "PRINCIPAL SUPPLY".

Hence by analysing the Provision we find that in case of Composite Supply, the Rate of PRINCIPAL SUPPLY is taken into consideration.

Since your Principal Supply is Exempted, therefore, the Composite Supply shall be treated as "EXEMPT SUPPLY".

Regards.