Decide the best deal based on the following offers you get for a refrigerator.

Hitachi Japan Inverter $700$L $4-$doors Fridge

$\backslash$table$[[-$ Cash price of RM$5350,],[\backslash$table$[[10\%$ down payment$],[$Interest charged is $11\%$ based on reducing$],[$balance$],[-$ Term of payment: monthly instalments for $2],[$years$]],\backslash$table$[[-$ Interest charged is $8\%$ based on original$],[$balance$],[$Term of payment: monthly instalments$],[$for $30$ months.$]]]]$

$($a$)$ Calculate the total interest charged for both offers.

$($b$)$ Find the instalment price for each product.

$($c$)$ Which Shop will you choose, and give reason?