If a tile is rhombus shaped and its diagonals are 45cm and 30cm then find how much would cost to polish 2000

such tiles for $7.5 per m^2?(also do the way)

here diagonels are 45cm & 30cm
we know
area of rhombus is 1/2(d1*d2)
=1/2(45*30)
=675cm^2
=0.0675m^2
now
total area is
( 2000*0.0675)=135m^2
then
cost= $135*7.5
$1012.5

area to b polished = 1/2(d1*d2)
for 2000tiles total area = 2000*1/2*45*30=1350000m^2
total cost=1350000*$7.7