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1) la camiseta
This is because this is an item of clothing, whereas the other 3 words have to do with books.
Tu estás. Él, Ella, Usted: está Nosotros/as: estamos. Vosotros/as: estáis. so like if you where to say estoy haciendo la tarija para la escuela you can also put soy/ or yo estoy
Translates to: how to calculate the annual interest of my savings account