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7.Profit and Loss
medium
Nutan pays $Rs.\, 2140$ for $3$ calculator and $4$ Pen while he pay $Rs.\, 1355$ for an additional calculator and $5$ Pen. Then what he paid for Calculator only in $RS.$?
A
$175$
B
$480$
C
$655$
D
Can't be determined
Solution
Let cost of $1$ calculator be Rs. ${ }^{\prime} C^{\prime}$
and cost of $1$ pen be $Rs$. $'P'$
According to question:
$3 C+4 P=2140$
$1 C+5 P=1355$
Solving $(i)$ and $(ii)$
We get $C=$ Rs. $480 \quad[$ cost of $1$ calculator]
Standard 13
Quantitative Aptitude