Question

A set of 30 calculators would have cost 4'498.50₹ in the early 1990 how ever in 2010 ' 30 calculators could he purchased for 1057.50₹ how much less in the price of one calculators in 2010 than in 1990?

Answer 1

Define a relation R on the set N of natural numbers by
R = {(x, y) : y = x + 7, x is a natural number less than 4; x, y ∈N}. Write down the domain and the range.

Answer 2

Answer:

Rs. 114.7

Step-by-step explanation:

Price of 30 calculators in 1990- Rs. 4498.50

Cost of one calculator in 1990- 4498.50/30= Rs. 149.95

Price of 30 calculators in 2010= Rs.1057.50

Cost of of one calculator in 2010- 1057.50/30= Rs.35.25

Therefore The price of one calculator in 2010 is less than the price of one calculator in 1990 by= 149.95 - 35.25 = Rs. 114.7

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