Answer :

Formula used.

Loss/profit percent = × 100

(a). If we take point (40,50)

We get

40y = 50x

4y × 10 = 5x × 10

∴y= × x

(b). If productive cost of jute is Rs. 60

Then x= 60

y = ×60

y = =Rs. 75

(c). By watching graph

We can see that having y =Rs. 125

Where line crosses at point having x = Rs. 100

∴ Cost price will be Rs. 100

(d). For writing Profit %

Let’s take point (40,50)

Where cost price = Rs. 40

Profit = Selling price – Cost price

= 50 – 40 = 10

Loss/profit percent = × 100

Profit % = × 100

=25%

(e). For writing Profit % on selling price

Let’s take point (40,50)

Where cost price = Rs. 40

Profit = Selling price – Cost price

= 50 – 40 = 10

Loss/profit percent on selling price = × 100

Profit % on selling price= × 100

=20%

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