Using estar (not ser) + preposition a with fluctuating quantities and prices

When we use the preposition a in order to talk about fluctuating quantities and prices, we need to use the verb estar (not ser).
Read and listen to these examples:

La libra estará a 1.14 euros.The pound will be worth €1.14.

Un kilo de queso está a 15 euros.A kilo of cheese costs 15 euros.

El dólar estaba a 0.75 libras.The dollar was worth £0.75.

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Examples and resources

La libra estará a 1.14 euros.The pound will be worth €1.14.
El dólar estaba a 0.75 libras.The dollar was worth £0.75.
Un kilo de queso está a 15 euros.A kilo of cheese costs 15 euros.
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