Using the supply schedule and Kerala demand schedule for the fish Puntius euspilurus: | Price P per kg (in ₹) | Quantity (X) of Fish Supplied (in kg) | |---|---| | 25 | 800 | | 20 | 700 | | 15 | 600 | | 10 | 500 | | 5 | 400 | | Price (p) per kg (in ₹) | Quantity (x) of Fish Demanded (in kg) | |---|---| | 25 | 200 | | 20 | 400 | | 15 | 600 | | 10 | 800 | | 5 | 1000 | The consumers' surplus at equilibrium price is (a) 18009 (b) 13500 (c) 9000 (d) 4500

> [!TLDR] > Using the demand curve $p=30-\tfrac{x}{40}$ with $x_0=600$, $p_0=15$, the consumers' surplus is $\int_0^{600}p\,dx-p_0x_0=\text{₹}4500$ — option (d). > [!FORMULA] > **Consumers' surplus:** $\displaystyle CS=\int_0^{x_0}p\,dx-p_0x_0$. 1. Demand $p=30-\dfrac{x}{40}$, equilibrium $x_0=600$, $p_0=15$. …

Using the supply schedule and Kerala demand schedu – Class 12 Applied Mathematics

Case Based · Q5

Using the supply schedule and Kerala demand schedule for the fish Puntius euspilurus:

Price P per kg (in ₹)	Quantity (X) of Fish Supplied (in kg)
25	800
20	700
15	600
10	500
5	400

Price (p) per kg (in ₹)	Quantity (x) of Fish Demanded (in kg)
25	200
20	400
15	600
10	800
5	1000

The consumers' surplus at equilibrium price is

18009
13500
9000
4500

Sikkim CbseNCERTSubjective· 1mImportance★★★★★est

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Concept understanding — Supply Schedule

Supply Schedule: From Intuition to Definition

Imagine you run a small stall selling lemonade. On a hot day, you might be willing to sell 50 glasses at ₹10 each. But if the price jumps to ₹20, you'd happily make and sell 100 glasses — maybe even stay open longer. If the price drops to ₹5, you'd barely bother, selling only 10 glasses.

That relationship — "at this price, I will supply this much" — is the core idea. A supply schedule is simply a table that records this pairing: for each possible price, it shows the quantity a seller is willing and able to offer for sale.

The Precise Statement

A supply schedule is a tabular statement that shows the different quantities of a commodity that a firm (or an industry) is willing and able to offer for sale at different possible prices, during a given period of time, ceteris paribus (all other factors held constant).

There are two types:

Type	What it shows	Who it's for
Individual Supply Schedule	One seller's quantities at various prices	A single firm
Market Supply Schedule	Total quantities from all sellers at various prices	The entire market

Market Supply = Sum of all Individual Supplies at each price

A Concrete Example

Individual Supply Schedule (Lemonade Stall)

Price (₹ per glass)	Quantity Supplied (glasses per day)
5	10
10	50
15	80
20	100

Notice the pattern: as price rises, quantity supplied rises. This is the Law of Supply — the direct, positive relationship between price and quantity supplied, visible directly in the schedule. …

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Using the demand curve $p=30-\tfrac{x}{40}$ with $x_0=600$ , $p_0=15$ , the consumers' surplus is $\int_0^{600}p\,dx-p_0x_0=\text{₹}4500$ — option (d).

\displaystyle CS=\int_0^{x_0}p\,dx-p_0x_0

Demand $p=30-\dfrac{x}{40}$ , equilibrium $x_0=600$ , $p_0=15$ . …

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