1.  C

Cost of flight previous year = $330
Booking fee last year = $50
Cost without booking fee = 330 – 50 = $280
Ratio of basic cost : taxes = 3 : 2
Total parts = 3 + 2 = 5
BASIC COST last year = (280 ÷ 5) x 3 = $168
TAXES COST last year = (280 ÷ 5) x 2 = $112

Basic cost rose by 20%. So cost now would be 100% + 20% = 120% (in decimals = 1.2)
Basic cost this year = 168 x 1.2 = $201.60

Taxes cost rose by 10%. So cost now would be 100% + 10% = 110% (in decimals = 1.1)
Basic cost this year = 112 x 1.1 = $123.20

Booking fee reduced by 50%.
Booking cost now = 50 ÷ 2 = $25

Total cost of flight = $201.60 + $123.20 + $25 = $349.80