Three friends went to a hotel and had breakfast to their taste, paying tim
respectively. Find their mean expenditure fi) If they have spent 3 times tem
hey have already spent, what would their mean expenditure be? (imele
eiers 50% discount, what would their mean expenditure be? (iv) Dove
relationship between the change in expenditure and the change in me
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Answered by
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Step-by-step explanation:
Let three friends be A, B and C
According to the question,
Expenditure of A =Rs.16
Expenditure of B =Rs.17
Expenditure of C =Rs.21
(i)
Their mean expenditure is,
=
3
16+17+21
=
3
54
=Rs. 18
(ii)
New expenditure of A =Rs.16×3=Rs. 48
New expenditure of B =Rs.17×3=Rs. 51
New expenditure of C =Rs.21×3=Rs. 63
Their new mean expenditure is,
=
3
48+51+63
=
3
162
=Rs. 54
(iii)
Total amount =Rs. 54
After discount net amount to be paid =54×
100
50
=Rs. 27
Their mean expenditure is,
=
3
27
=Rs. 9
(iv)
The change in the expenditure and the change in the mean expenditure are proportionate to each other.
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