The correct preposition is "in" when referring to a reduction or decrease in something, such as prices.
Other options:
About: Does not fit the context of describing a decrease.
On: Incorrect in this context.
Of: Refers to possession or belonging, not a decrease.
NIGGARD (کنجوس، بخیل)Miser – (بخیل، کنجوس)
The ‘solid’ reason is that the preposition ‘at’ is always used with ‘jeer
We should not jeer at the poor
jeer at, jest at, sneer at, smile at, laugh at etc.
Genius for use when any one very good at doing something.
The indefinite article (a, an) is used before a noun that is general or when its identity is not known.
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