Thank you for the opportunity to help you with your question!
If an individual has a ‘PP’ or ’pp’ genotype the alleles are ‘homozygous’. If an individual has a mixed Pp genotype the alleles are definitely ‘heterozygous’. so according to the question the answer will be 50% to 50% since they both have equal alleles.
Please let me know if you need any clarification. I'm always happy to answer your questions.