On January $2,2018,$ Wang Company acquired equipment to be used in its manufacturing operations. The equipment has an estimated useful life of $10$ years and an estimated salvage value of $$45,000.$ The depreciation applicable to this equipment was $$210,000$ for $2021,$ computed under the sum$-$of$-$the$-$years'$-$digits method. What was the acquisition cost of the equipment?

$$1,605,000$

$$1,625,000$

$$1,650,000$

$$1,695,000$