Thandi Loves Toffees A Use This Information to Construct Thandi's Demand Curve for Places

Thandi loves toffees. The table shown reflects the value Thandi places on each toffee she eats:
$\begin{array}{|l|l|}\hline \text { Value of first toffee } & \text { R0.60 } \\\hline \text { Value of second toffee } & \text { R0.50 } \\\hline \text { Value of third toffee } & \text { R0.40 } \\\hline \text { Value of fourth toffee } & \text { R0.30 } \\\hline \text { Value of fifth toffee } & \text { R0.20 } \\\hline \text { Value of sixth toffee } & \text { R0.10 }\\\hline\end{array}$
a. Use this information to construct Thandi's demand curve for toffees.
b. If the price of toffees is R0.20, how many toffees will Thandi buy?
c. Show Thandi's consumer surplus on your graph. How much consumer surplus would she have at a price of R0.20?
d. If the price of toffees rose to R0.40, how many toffees would she purchase now? What would happen to Thandi's consumer surplus? Show this change on your graph.