Friendly Company provides the following ABC costing information:

$\backslash$table$[[$Activities$,$Total Costs,$\backslash$table$[[$Activity$-$Cost$],[$Drivers$]]],[$Account inquiry hours,$$250,000,10,000$ hours$],[$Account billing lines,$$125,000,5,000,000$ lines$],[$Account verification accounts,$$50,000,50,000$ accounts$],[$Correspondence letters,$$25,000,5,000$ letters$],[$Total costs,$$450,000,]]$

The above activities are used by Departments A and B as follows:

$\backslash$table$[[,$Department A$,$Department B$],[$Account inquiry hours,$1,000$ hours,$3,000$ hours$],[$Account billing lines,$200,000$ lines,$300,000$ lines$],[$Account verification accounts,$10,000$ accounts,$8,000$ accounts$],[$Correspondence letters,$1,000$ letters,$1,500$ letters$]]$

How much of the account billing costs will be assigned to Department B$?$

Select one:

a$.$ $$15,000$

b$.$ $$12\mathrm{.}500$

c$.$ $$25,000$

d$.$ $$7,500$