Estar for fluctuating quantities
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 125 pesos.A kilo of cheese costs 125 pesos.
El dólar estaba a 0.75 libras.The dollar was worth £0.75.
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