A firm pays salaries on the last Monday-to-Friday working day of every month. Using the January page shown, in how many months of that year is pay day a Friday?

Pay day is a Friday when the month ends on Friday, Saturday or Sunday. Month ends in leap year 2028: Jan Mon, Feb Tue, Mar Fri, Apr Sun, May Wed, Jun Fri, Jul Mon, Aug Thu, Sep Sat, Oct Tue, Nov Thu, Dec Sun. Fri/Sat/Sun ends: March, April, June, September, December = 5. (4 misses a month ending on a weekend.)