Question 637362
LET THE INVESTMENT OF JOHN IN QANTAS BE $'X'.
THEREFORE, INVESTMENT IN TELSTRA    IS  $'(X + 1500)'.

EARNINGS FROM QANTAS = 9 * X /100 .
EARNINGS FROM TELSTRA = 11 * (X + 1500) / 100

TOTAL EARNINGS = (9X + 11 (X + 1500))/100 = 1475
9X + 11X + 16500 = 147500

20X = 147500-16500
20X = 131000

X = $6550

THEREFORE, JOHN INVESTED $6550 IN QANTAS SHARES