Break even analysis

Please solve this-

A medical care unit of a PHC( Primary Health Care ) consists of 6,000 patient days. The income recieved by the unit was Rs. 30,00,000. The total variable and fixed costs amounted to Rs . 7,50,000 and Rs. 8,40,000. How much number of patient days are required by the unit to break-even ?  

a) 187 patient days

b) 194 patient days

c) 125 patient days

d) 140 patient days

Sales value - 30,00,000

less Varaible Cost - 7,50,000

Contribution - 22,50,000

Contribution per unit = 22,50,000/6000  = 375 

Break even point = 8,40,000/375 = 2240 /12 = 187 patient days to reac break even poin.