Question

the cost of 10 apple is 125.find The cost of 25 apple

Answer 1

10=125
25=?

=125×25÷10
=312.5

the cost of 25 apples will be 312.5

Answer 2

Cost of 10 apples = 125
Taking derivative both sides,
d/dc (10) = d/dc (125)
=> c = 12.5
Therefore, taking log both sides,
log10. c = log10. 12.5
=> 25 × log10. c = 25 × log10. 12.5
=> 25c = 312.5
Therefore cost of 25 apples = 312.5