The following diagram shows the debt, the payments, the dates at which

such payments are made, and the days to settlement:

Value $ofR3000=3000(1+0,15\frac{192}{365})$

$=3236,71$

The value of the debt at the end $(15$ August$)$ is R$3236,71.$

The values of the three payments on $15$ August are, respectively

$P_1=1000(1+0,15\frac{116}{365})$

$=1047,67.$

$P_2=600(1+0,15\frac{95}{365})$

$=623,42.$

$P_3=700(1+0,15\frac{65}{365})$

$=718,70.$

Thus, the total value of the payment is

R$2389,79(1047,67+623,42+718,70).$

The outstanding debt on $15$ August is thus R$846,92(3236,71-2389,79).$