If Property tax is $20000.$ Interest expense is $7000.$

Suppose according to tax regulation, the above two items can provide tax saving.

If one's marginal tax rate is $20\%.$

How much is the tax saving $($i$.$e$.$ if one incurs both property tax and interest expense, how much tax could be possibly reduced, assuming that person has enough tax burden$)?$

A$\mathrm{.}27000$

B$\mathrm{.}5400$

C$\mathrm{.}20000$

D$\mathrm{.}7000$