The loss will be same as long as current magnitude is same irrespective of what the power factor (pf) of the load current is. Just to clarify consider a single phase 110 V /220 V transformer . Let its Req=eqivalent resistane be 3 ohm (referred to 220 V side). Let it be rated 2.2 kVA.
Actually in the US is the cost of sand is about $11-13/Ton.
1 cubic meter of water of density1 weighs 1000 kg= 1 metric ton. If the sand density is 1.45 (?) One cubic metre of sand weighs 1450 kg 1 metric ton(1000kg)of sand costs us$7 Cost of 1450 kg of sand= us$10.15.) 1 cubic metre of sand weighs 1450 kg or 1.45 metric ton taking the specific gravity of sand as 1.45 (as stated in part 3 of the question). Hence 1 cubic meter of sand should cost US$ 7 x 1.45 = US$ 10.15.