Based on the following confusion matrix with a validation set of $100,$ class $1$ reflects the members who purchase additional services and class $0$ reflects the respondents who did not purchase these services. Our model predictions are cross$-$tabulated with these responses in the confusion matrix. With future use of this model, those who are predicted to purchase the services will be targeted with a personalized ad and those not predicted to purchase the services will not be targeted with a personalized ad$.$ Calculate the overall accuracy rate.

Actual Class Predicted Class $1$ Predicted Class $0$

Class $11810$

Class $01260$

Multiple Choice

$30\%$

$18\%$

$28\%$

$60\%$

$78\%$