Question

1) Find the cost of
30 note books at the rate
of 200 perdezen​

Answer 1

Step-by-step explanation:

Dozen means 12 books

so,

12books=20rs

30books=?

let the cost of 30 books be x

cross multiply

we get,

30*20=12*x

30*20/12=x

600/12=x

50=x

therefore the cost of 30 books is R.s 50

Answer 2

Answer:

₹500

Step-by-step explanation:

Cost of 12 notebooks = ₹200

Cost of one notebook = ₹200/12 = ₹16.67

Cost of 30 Notebooks = ₹16.67 ×30 = ₹500.1

500.1 can be estimated into 500.

∴₹500