Sensitivity and Specificity question

A screening test was applied to a population of 1,000 patients, of whom 200 (by “gold standard” diagnostic criteria) were infected with a certain virus.  195 of the 200 infected patients tested positive.  245 of the 800 uninfected patients also tested positive.
 
The test sensitivity is: ____ percent 

 The test specificity is:  ____ percent

The test positive predictive value is:  ____ percent

The test negative predictive value is ____ percent