Tia cut a 4- meter 8-centimeter wire into 10 equal pieces. Marta cut a 540-centimeter wire into 9 equal pieces. how much longer is one of Marta's wires then one of tia's pls help

The wire is 4 meter and 8 centimeter long, that is to say 408 centimeter long total, and it is divided in 10 pieces, so we do:
tia = 408/10 = 40.8 cm
That is to say that Tia's wire pieces are 40.8 cm long

For Marta's wire, it is 540 centimeter long and is divided into 9 pieces, that is:
marta = 540/9 = 60 cm
Then Marta's wires are longer than those from Tia's, let's see for how much:
marta - tia = 60 - 40.8 = 19.2
therefore, Marta's wires are longer than Tia's wires for 19.2 cm

The shelves will hold 270 books in total

Yes you do, so £1973.09 - £1473.50 = £499.59 so tim overpaid £499.59 .hope this ; )