Q1: How much would Harry Weasley need to pay for a new Firebolt broomstick if it cost 98765 galleons?

A1: Harry would need to pay 98765 galleons for the Firebolt broomstick.

Q2: If Hermione Granger had won 45632 galleons at the Quidditch World Cup, how much would she have left if she used all of it to buy a Chocolate Frog?

A2: Hermione would have 43113 galleons left if she bought a Chocolate Frog with all 45632 galleons she had won.