First lets figure out how much she spends in one year. There are 52 weeks in one year
She spends 12 on a ticket and 10 on snacks, or 22 dollars each time
22 * 52 = 1144 dollars in a year.
She decides to go on Tuesday where the ticket is 1/2 prices or 1/2 ( 12) = 6 and no snacks ( 0 dollars)
Her cost is 6 dollars. There are still 52 weeks in a year
6 * 52 = 312 dollars
She saves
1144 - 312 = 832 dollars