Zinc is a vital part of our diet and the recommended daily allowance(RDA) for zinc is 11 mg for males and 8 mg for females. You can have a combination of foods to give you the zinc your body needs. The tolerable upper intake level(UL) is 40 mg. Here's how you can achieve your portion of zinc under Rs.100
Pumpkin seeds (7.64 mg per 100 gm): They are available for Rs. 295-300 for 250 gm. This can be a part of your combination.
Wheat germ (14.1mg per 100 gms): Wheat germ is available for Rs 150 per 340 grams. This can give you a good portion of your daily zinc requirement.
Lentils(3.3 mg per 100 gms): You can find them for around Rs. 300 per 450 gm. You should add this to your diet daily.
Cashew( 5.78 mg per 100 gm): Cashews are available for Rs 250 per 200 gram. This can give you a good portion of zinc.
Nutritional yeast(3.0 mg in two tbs): 127 grams nutritional yeast comes for Rs. 428. A part of your zinc requirement can be taken care by this.