Suppose there is a new treatment to treat a patient. The new treatment will be successful with complete certainty and the patient will live for 3 more years. The health utility index for the new treatment is 0.4. What is the present discounted value of Quality Adjusted Life-Years (QALYs) for this new treatment if the annual interest rate is 10%? (Hint: do not discount the first life-years gained.)

I've done that QALY=#of life year saved*health utility index=3*0.4=1.2

and know that PV=fv/(1+r)^(t-1)

I do not really understand the question, where can I get my t? Is this t equals to the 3 more years life time?