A company makes a pack of baseball cards. Costs are $$\mathrm{.}60$ per pack $($ fixed$=$$$\mathrm{.}25$ and variable$=$ $$\mathrm{.}35).$ A customer wants to buy $50,000$ packs for $$\mathrm{.}40/$pack$.$ If accepted income would:

a$.$ Decrease by $$10,000$

b$.$ increase by $$7,500$

c$.$ Decrease by $$2,500$

d$.$ Increase by $$2,500$