<prompt> If a patient has a creatinine clearance of 90 mlmin, a urine flow rate of 1 mlmin, a plasma K concentration of 4 mEqL, and a urine K concentration of 60 mEqL, what is the approximate rate of K excretion?0.06 mEqmin0.30 mEqmin0.36 mEqmin3.6 mEqmin  <response>: K excretion rate urine K concentration x urine flow rate 60 mEqL x 0.001 Lmin 0.06 mEq min. 