Shen Athletics purchased factory equipment with an invoice price of $ 92,000.

Other costs incurred were freight costs, $ 2,500; installation of wiring and foundation, $ 2,200; material

and labor costs in testing equipment, $ 700; oil lubricants and supplies to be used with equipment, $ 500;

one-year fire insurance policy covering equipment, $ 1,400.

The equipment is estimated to have an $ 8,000 residual value at the end of its 5-year useful service life.

Required:

a) If the double diminishing-balance method of depreciation was used,

the constant percentage applied to a diminishing carrying amount would be ______.