Sergio lives at the corner of 16th street and 19th avenue. saskia lives at the corner of 20th street and 3rd avenue. located 1/4 of the distance from sergio's place to saskia's place is the post office. where is the post office located

First, let's check the amount of power consumed by each of the appliances for 10 hours. the calculated values are shown below.

dryer = (4000 watts per hour) (10 hours) = 4 watts or 40 kw
heater = (1500 watts per hour)(10 hours) = 15000 watts or 15 kw
radio = (40 watts per hour)(10 hours) = 400 watts or 0.40 kw

now, adding the total consumed by the three appliances for 10 hours, we have

total = 40 + 15 + 0.40 = 55.40 kw

since we now have the  total power consumed, and given that electricity costs 4.30 cents per kwh, we have

cost = 55.40(4.30) = 238.22 cents 

rounding off the cost to the nearest cents, we have a total amount of 238 cents for the total electricity cost.

answer: 238 cents