Four friends bought different kind of fruits from the market. When they got home they could not remember the individual prices per kilogram, but 3 if them can remember the total amount that they each paid. The weight of the fruits and the total amount paid are shown as the following:
Pineapple (kgs) Mr A Mr B Mr C Mr D
1.15 kgs 1.20 kgs 2.15 kgs 1.30 kgs
Mangoes (kgs) Mr A Mr B Mr C Mr D
0.60 kgs 0.45 kgs 0.90 kgs 0.25 kgs
Orange (kgs) Mr A Mr B Mr C Mr D
0.55 kgs 0.30 kgs 0.65 kgs 0.50 kgs
Amount paid in ($) Mr A Mr B Mr C Mr D
$8.28 $6.84 $13.05 $ ?
Assuming that for each variety of fruit, the price per kilogram paid by each of the three friends is the same. Calculate the amount which Mr D paid.
Please advise and thank you in advance for the effort