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Identify the category under which the following sums of money enter the expenditure$-$based national income accounts.

$\backslash$table$[[$Example$,],[$Firm $$ sells $50,000$ pairs of shoes it produces to foreign retail stores, who then sell the shoes to their customers at $$35$ per pair.,$],[$The government pays $$500$ billion interest on its national debt, and its social security expenditure was $$800$ billion this year.,$],[$Raymond bought a second $-$ hand, three year old bike from a friend for $$800.,],[$Firm B sources watches worth $$450$ each from international factories and sells them to its domestic customers.,$],[$Hewlett $-$ Packard has $200,000$ new printers worth $$500$ million in its stores waiting to be sold.,$]]$

The market value of the watches sold by Firm B will be $$ in the expenditure$-$based GDP calculation.