A government decides to encourage apple consumption as a report states that eating apples is good for health. It subsidises apple growers.
The diagram shows the market for apples.
What would the subsidy need to be to change the market equilibrium quantity from ${Q_1}$ to ${Q_2}$?

1 )
$O{P_1}$
2 )
${P_1}{P_2}$
${P_1}{P_3}$
4 )
${P_2}{P_3}$
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