An electronic repair shop offers three types of service: on-site, at-store, and by-mail. On-site service costs 3 times as much as
at-store service. By-mail service costs $10 less than at-store
service. Last week, the shop completed 15 services on-site, 40
services at-store, and 5 services by mail for total sales of
$2650.

studdyy use ur brain yall

Step-by-step explanation:An electronic repair shop offers three types of service: on-site,

at-store, and by-mail. On-site service costs 3 times as much as

at-store service. By-mail service costs $10 less than at-store

service. Last week, the shop completed 15 services on-site, 40

services at-store, and 5 services by mail for total sales of

$2650.

what is a pre-existing condition claus?

means if you're already damaged some way when you take out a medical insurance you will not get full compensation for that injury that you already have.